Mental math can save you valuable time in exams and daily life. Here are some proven techniques:
1. Squaring numbers ending in 5
For any number ending in 5, the square always ends in 25. The first part is the number multiplied by (itself + 1). Example: 35² = 3×4 = 12, so 35² = 1225.
2. Multiplying by 11
For two-digit numbers: add the digits and place the sum in the middle. Example: 23×11 = 2 (2+3) 3 = 253.
3. Percentage shortcuts
10% of a number = move decimal one place left. 5% = half of 10%. 20% = double 10%.
Practice these daily for 10 minutes and watch your speed improve!