All modules
Mental Maths
Speed tricks for everyday addition, multiplication and checks
Multiply by 11
Add neighbouring digits to multiply any number by 11 instantly
Left-to-Right Addition
Add big numbers by starting from the biggest place value, not the smallest
Divisibility Shortcuts
Check divisibility by 3, 9 or 11 without doing the actual division
Multiply by 5, 25, 125
Turn multiplication by 5/25/125 into multiplying by 10s and halving
Percentage-Fraction Shortcuts
Recognize common percentages as simple fractions to divide instead of multiply