Free online math practice
Mental Math Practice
Practice the small relationships that make calculations easier to do in your head: friendly-number complements, place-value changes, familiar percentages and exact benchmarks.
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- Progress stays on this device.
Find your starting point
Mental calculation is about choosing a useful relationship, then recalling it accurately. Math tricks is an optional topic with problem guidance; you do not need a shortcut to answer correctly.
Try a few examples
Real practice. Real progress.
Enter an exact number. Equivalent fractions, decimals, and percentages are accepted.
Choose what to practice
Each Start opens that topic’s available practice. This grouping does not launch a combined session or enroll you in a course.
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Mental complements
Finding the amount needed to reach a nearby friendly number.
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Mental addition within 100
Totals up to 100: whole tens, no regrouping, and crossing one ten with a single digit.
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Mental subtraction within 100
Subtract within 100: whole tens, no regrouping, and crossing one ten with a single digit.
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Mental percent of a quantity
Finding common percentages of a number mentally.
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Fraction-decimal equivalences
Converting familiar fractions to decimals and decimals to fractions.
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Unit conversion benchmarks
Recall the exact conversion for one unit.
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Math tricks
Mental shortcuts for multiplication, percentages, and squares. Each problem has optional guidance in its info button.
Learn more about Math tricks
Further reading
Start practicingMental Math Practice
- Free to practice.
- No account required.
- Progress stays on this device.