Here is the list of mathematical exercises on mental calculation available online for free. Each corrected exercise is accompanied by indications, reminders of the course, and methodological advice, which allows you to practice independently.
Exercise example :
Use yellow numbers and blue arithmetic operators to calculate the target number.
The mental math games topic is available for : 6th Grade, 7th Grade, 8th Grade, 9th Grade
List of exercises by class : middle and high schools, 6th Grade, 7th Grade, 8th Grade, 9th Grade, 10th Grade, 11th Grade, 12th Grade.