Top Math Tricks to Speed Up Your Calculations
Master these quick math tricks to solve problems faster than ever!
1. Multiplying Any Number by 5
To multiply a number by 5, simply divide it by 2 and move the decimal point. Example:
42 × 5 = (42 ÷ 2) = 21 → Add a zero → 210
2. Squaring Numbers Ending in 5
For any number ending in 5, multiply the first digit by its successor and add 25 at the end.
Example: 25² → (2 × 3)25 = 625
3. Quick Percentage Calculations
To find 10% of a number, move the decimal one place left. To find 5%, take half of 10%.
Example: 10% of 120 = 12; 5% of 120 = 6
4. Trick for Multiplying by 9
Use your fingers: Spread both hands and fold the finger corresponding to the number being multiplied by 9.
The number of fingers to the left is the first digit, and the fingers to the right form the second digit.
Example: 9 × 7 → Left: 6, Right: 3 → Answer: 63