it's all about mental math!
square numbers and square roots
squaring numbers |
calculating the square root of any number |
square roots of perfect squaresinstant doubles |
numbers that end on 5 |
percentages
quick percentages |
shortcut trick |
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fractions
converting decimals to fractions |
addition
addition using compensation |
adding large numbers |
multiplication
Quick multiplication tipsmultiply using base of 20 or 30 |
multiplying by base of 10multiply 2 digit numbers up to 100 |
division
fast division |
division using compensation |