A selection of free mathematical resources (calculators, exercises, games, quizzes, course reminders) to learn how to calculate with different types of numbers.

A **prime number** is an integer greater than or equal to 2 that has no divisors other than 1 and itself.

Any integer greater than or equal to 2 is prime or product of primes.

When we write an integer as a product of prime numbers, we say that we
decompose this integer into a product of prime numbers.

A percentage is defined as a proportionality coefficient expressed as a fraction with a denominator of 100.

To calculate p% of a number is to multiply that number by `p/100`.

Performing Euclidean division of a by b,
is equivalent to determining two numbers, the **quotient (q) and the remainder (r) such that a = b*q + r** .

- amplitude : amplitude of a complex number. The amplitude calculator determines the amplitude of a complex number from its algebraic form.
- arithmetic_solver : countdown solver. This countdown solver allows finding a target number from a set of integer in using arithmetic operations.
- arrangement : number of arrangement of a set calculator. To calculate online the number of arrangement of p elements of a set of n elements.
- average_speed : average speed calculator . The calculator returns a speed in km/h from a distance and a duration, or from a pace (duration necessary to cover 1 kilometer).
- base_converter : Base-n converter. The calculator allows you to make decimal, binary, hexadecimal conversions, and more generally to any base n between 2 and 36.
- binomial_coefficient : calculation of binomial coefficients. A binomial coefficient calculator that allows you to calculate a binomial coefficient from two integers.
- combination : to count the number of combinations. To calculate the number of k elements of part of a set of n elements.
- complex_conjugate : complex conjugate calculator. The online conjugate calculator returns the conjugate of a complex number.
- complex_modulus : complex modulus calculator. The modulus calculator allows you to calculate the modulus of a complex number online.
- complex_number : complex number calculator. The complex number calculator allows to perform calculations with complex numbers (calculations with i).
- complexe_solve : solving quadratic equation with complex number. The complex number equation calculator returns the complex values for which the quadratic equation is zero.
- convert : measurement conversions. The measurement unit calculator allows online conversions volume, surface (area), length.
- convert_speed : Speed conversions. The speed converter allows online conversions to :.kilometers per hour, meters per second, miles per hour, feet per second, knots
- euclidean_division : quotient and remainder calculator. The calculator allows to find online the quotient and the remainder in the euclidean division of two polynomials or two integers.
- factorial : factorial calculator. The factorial of a natural number n is the product of the positive integers less than or equal to n. The factorial calculator allows you to find this number.
- gcd : gcd calculation online. GCD calculator that uses Euclid's algorithm to give the steps of the GCD calculation.
- hours_calculator : hours calculator. Time calculator that allows you to make hourly calculations and time conversions using the h:min:s (hours, minutes, seconds) format.
- imaginary_part : imaginary part of complex number. The imaginary part calculator allows you to calculate online the imaginary part of a complex number.
- is_even : parity of a number. is_even function returns 1 if the number is even, 0 otherwise.
- is_odd : parity of a number. is_odd function returns true if the number passed is odd, false otherwise.
- lcm : least common multiple. LCM calculator to calculate the least common multiple (LCM).
- loan_insurance : Calculation of the monthly payments of the insurance of a credit. Credit insurance monthly payment calculator: real estate credit, consumer credit, and other types of credit.
- monthly_loan : Calculation of the monthly payments of a loan. Loan monthly payment calculator : home loan, consumer loan, and other types of loan.
- pace_to_speed : pace to speed converter. The calculator allows you to convert a pace (time needed to cover 1 kilometer) into speed expressed in km/h.
- permutation : permutation calculator. To calculate online the number of permutation of a set of n elements.
- prime_factorization : prime factorization calculator. The function prime_factorization is used to calculate online the decomposition of an integer into prime factors.
- pythagorean : Pythagorean theorem calculator. The calculator uses the Pythagorean theorem to verify that a triangle is right-angled or to find the length of one side of a right-angled triangle.
- real_part : real part of complex number. The real part calculator allows you to calculate online the real part of a complex number.
- speed_to_pace : speed to pace converter . Pace calculator from a speed in km/h, the pace is the time to cover a distance, usually expressed in min/km or min/mile.
- time_converter : time converter. Time calculator that can convert durations into seconds, minutes, hours and days.

- game about area calculations of usual figures. (numbers): This game allows you to practice the calculation of simple surfaces: square, rectangle, circle.
- Duration calculation game (numbers): This game on time calculations allows to practice manipulating durations expressed in days, hours, minutes, seconds (d, h, min, s).
- math game with integers (numbers): In this calculation game with integers, kids must find the right answer in a list of values.
- Quiz on the calculation of the GCD (numbers): This Greatest Common Divisor quiz gives practice in calculating the GCD of two integers.
- Calculation game percentages (numbers): To succeed in this game on the calculation of the percentage of a whole number, kids must choose the good answer among a list of proposition.
- magic square game (numbers): The goal of the game is to complete a magic square that has empty areas.
- Measurement conversion game (numbers): This math game allows you to practice converting length and area measurements.
- time conversion game (numbers): This game allows you to practice making conversions on days, hours, minutes, seconds (d, h, min, s).
- find the denominator game (numbers): In this fraction game, children must complete an equality involving a fraction by finding the missing denominator in a list.
- division game (numbers): Online game of calculation, which allows practicing integer division.
- criteria divisibility game (numbers): Online calculation game, which allows to train to recognize if a number is divisible by 2, 3, 4, 5, 9, 10, 25, 100.
- fraction game (numbers): Online fraction game suitable for anyone looking for a good math game online.
- Fraction calculation game (numbers): This math game is based on the calculation of whole fractions. To win this quiz, you just have to find the result of an operation between two fractions.
- fraction comparison game (numbers): The purpose of this integer fraction comparison game is to find the operator (> or <) to place between the fractions being compared.
- irreducible fraction of an expression (numbers): To pass this quiz on irreducible fractions, you just have to find the irreducible form of an operation between several fractions.
- Fraction to percentage transformation game (numbers): In this game of transforming a whole fraction into a percentage, children must choose the correct answer from a list of suggestions.
- countdown game (numbers): The goal of the countdown maths game is to find a target number using arithmetic operations from a list of given numbers.
- multiplication game (numbers): The goal is to choose from a list the multiplication that allows to calculate a given number online.
- Game multiplication by 10, 100, 1000 or 0.1, 0.01, 0.001 (numbers): The goal of this quiz is to multiply a number by 10, 100, 1000 or 0.1, 0.01, 0.001. To win this game, you just have to find the right result in a list.
- number comparison game (numbers): The goal of this integer comparison game is to find the operator (less than, greater than or equal to) to place between the numbers being compared.
- missing number game (numbers): Online calculation game: You must find the missing number in a mathematical expression.
- perimeter game (numbers): This game allows you to practice calculating perimeters on common shapes: square, rectangle, triangle, circle.
- the little math quiz (numbers): The little math quiz collects a set of small fun math exercises to do online for 7-11 year olds.
- proportionality game (numbers): The goal of this proportionality game is to find the value that completes a proportionality table.
- Quiz on the Pythagorean theorem (numbers): This quiz uses the Pythagorean theorem to calculate the hypotenuse of a right triangle.
- four operations game (numbers): This online game of mental calculation, allows to revise addition, subtraction, multiplication and division, It helps students in learning arithmetic operations.
- missing operator game (numbers): Online calculation game consisting of finding the missing operator in a mathematical expression.
- addition tables game (numbers): Addition tables game to learn, revise, memorize addition tables from 1 to 20 online.
- times tables game (numbers): Times tables game to revise and learn multiplication tables from 1 to 10 online.
- Subtraction tables game (numbers): Online mental calculation game to help to memorize the subtraction tables.
- three operations game (numbers): Online mental calculation game, allows to review addition, subtraction and multiplication, this game helps students to practise arithmetic operations.

- Exercise 1110, countdown game - mental math games : Countdown is an arithmetic exercise that allows you to practice quick mental calculation in an efficient way. The goal is to reconstruct an integer using other integers and basic arithmetic operations (+,-,*,/).
- Exercise 1111, compare two integers - relative numbers and plane reference system : The purpose of this exercise is to compare two integers, using the appropriate comparison operator.
- Exercise 1112, find the missing operation - relative numbers and plane reference system : The goal of this corrected exercise is to find the missing sign of an arithmetic expression, course reminders accompany this exercise.
- Exercise 1113, calculate the percentage of an integer - proportionality : The purpose of this math activity is to calculate the percentage of an integer.
- Exercise 1116, euclidean division of two integers - integers and decimals : The purpose of this exercise on Euclidean division of two integers is to find the quotient and remainder.
- Exercise 1117, rounding a decimal number - integers and decimals : The purpose of this exercise is to round a decimal number to a given precision.
- Exercise 1118, place a point of given abscissa - integers and decimals : This graphical exercise allows to learn how to locate in the plane, to succeed, you just have to place at the right place a point of given abscissa.
- Exercise 1119, introduction to solving equations - introduction to equation solving - equations : The objective of this activity is to complete a "hole" operation, otherwise known as solving a simple equation.
- Exercise 1124, transform a decimal number into a percentage - proportionality : This exercise corrected of calculation makes it possible to practise on line to transform a decimal number into percentage.
- Exercise 1125, transform a fraction into a percentage - proportionality : This corrected math exercise allows you to practice transforming a fraction into a percentage online.
- Exercise 1132, evaluating a fractional expression - fractions : The purpose of this exercise is to give an approximate value to one decimal place of an algebraic.
- Exercise 1211, multiplication and addition of integers - operations on integers and decimals : The goal of this whole number math exercise is to practice multiplying and adding them.
- Exercise 1215, calculate a written expression in natural language - operations on integers and decimals : The objective of this corrected math exercise is to calculate a written expression in natural language.
- Exercise 1223, add, subtract, 2 numbers respecting the priorities of the operators - operations on integers and decimals : The purpose of this exercise is to calculate an arithmetic expression composed of addition and subtraction, taking into account the priorities of the operations.
- Exercise 1225, find the denominator of a fraction - operations on integers and decimals : The purpose of this corrected math exercise is to find the denominator of a fraction from an equality.
- Exercise 1226, check an equality for a given value - operations on integers and decimals : The purpose of this exercise is to verify an equality, the goal being to learn about equation solving.
- Exercise 1236, adding relative numbers - operations on integers and decimals : The purpose of this number math exercise is to practice adding relative numbers.
- Exercise 1237, find the missing number in an operation with relative numbers - operations on integers and decimals - introduction to equation solving - equations : The purpose of this corrected math exercise is to complete an equality that involves relative numbers.
- Exercise 1238, multiple additions and subtractions of relative numbers - operations on integers and decimals : The purpose of this math exercise is to string together a series of additions and subtractions of relative numbers.
- Exercise 1241, complete a magic square - relative numbers and plane reference system - introduction to equation solving : The purpose of this exercise is to learn about solving equations using magic squares.
- Exercise 1311, expand an algebraic expression - decimal writing and operations on relative numbers : The objective of this algebraic calculus exercise is to expand an algebraic expression.
- Exercise 1317, writing a product of numbers as a power of 10 - power : The objective of this numerical computation exercise is to write in the form of a power of 10 a product of numbers.
- Exercise 1318, writing in the form of a power of 10, a number raised to a power - power : The purpose of this exercise is to practice finding the writing in the form of a power of 10, of a number raised to a power.
- Exercise 1319, scientific notation of a number - power : The purpose of this corrected math exercise is to write a number with scientific notation.
- Exercise 1321, exponent grouping - power : This exercise allows to practice putting a product of numbers in the form of a power.
- Exercise 1322, complete an equality that involves powers - power : The purpose of this math exercise is to complete an equality that involves powers.
- Exercise 1324, rounding a square root - decimal writing and operations on relative numbers : The objective of this exercise is to give an approximate value of a square root to one decimal place.
- Exercise 1329, framing a fraction between two decimal numbers - comparisons of numbers, fractions, expressions - fractions : The objective of this math exercise is to frame a fraction using two decimal numbers.
- Exercise 1330, equating a problem - algebraic calculus : The objective of this math exercise is to equate a simple problem to solve it.
- Exercise 1331, recognize a proportionality table - proportionality : The purpose of this exercise on proportionality is to check that a table is indeed a proportionality table.
- Exercise 1332, coefficient of a proportionality table - proportionality : The purpose of this corrected calculus exercise is to find the coefficient of a proportionality table.
- Exercise 1333, find the missing value of a proportionality table - proportionality : The purpose of this exercise is to find the missing value of a proportionality table.
- Exercise 1334, proportionality table and cross product - proportionality : The purpose of this exercise is to complete using the cross product, a simple table so that it is a proportionality table.
- Exercise 1335, inequations of the first degree - comparisons of numbers, fractions, expressions : The goal of this math exercise is to solve a first degree inequation with one unknown.
- Exercise 1427, calculating the gcd of two integers - integers and rational numbers : The objective of this corrected arithmetic exercise is to calculate the gcd of two integers.
- Exercise 1428, check with the gcd if some numbers are prime between them - integers and rational numbers : The objective of this exercise is to use the GCD to check if two integers are prime to each other.
- Exercise 1511, absolute value of a numerical expression - order, absolute value, inequations : This corrected exercise consists simply in calculating the absolute value of a numerical expression.
- Exercise 1512, absolute value of a fraction - order, absolute value, inequations : This corrected exercise consists simply in calculating the absolute value of an algebraic expression composed of fractions.
- Exercise 1515, complete the decomposition of a number into prime numbers - order, absolute value, inequations : The purpose of this corrected exercise is to complete the decomposition of a number into prime numbers.
- Exercise 1516, find the ordered decomposition of a number in prime numbers - order, absolute value, inequations : The purpose of this exercise is to find the ordered decomposition of a number into primes.
- Exercise 1517, recognize a prime number - order, absolute value, inequations : The purpose of this corrected arithmetic exercise is to determine if a number is a prime number.
- Exercise 1518, find the ordered prime decomposition of a product of numbers - order, absolute value, inequations : The goal of this exercise is to find the ordered decomposition of a product of numbers into primes.
- Exercise 11171, integer rounding of a decimal number - integers and decimals : This exercise allows you to practice rounding a decimal number to the nearest whole number.
- Exercise 11172, rounding a decimal number with one digit after the decimal point - integers and decimals : To pass this problem on rounding, you just have to round correctly a decimal number to one digit after the decimal point.
- Exercise 11211, reading the coordinates of a point - relative numbers and plane reference system : This graphical reading activity consists in reading correctly the coordinates of a point placed in a reference frame.
- Exercise 11212, locating a point from its coordinates - relative numbers and plane reference system : To do this exercise of location in the plane, you must place a point in a reference frame from its abscissa and its ordinate.

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