What is the fastest way to multiply by 11?

To multiply any 2-digit number by 11, add the two digits and place the sum between them. For example: 34 × 11 = 3_(3+4)_4 = 374. If the sum exceeds 9, carry the 1 to the left digit.

How to calculate percentages mentally?

Use the 10% anchor method: Find 10% by moving the decimal left, then combine. For 15% of 80: 10% = 8, 5% = 4, so 15% = 12. For 25%, divide by 4. For 50%, divide by 2.

What are the best mental math techniques?

The most useful mental math techniques include: multiplying numbers near 100 (complement method), squaring numbers ending in 5, the lattice/crosswise method for multiplication, and anchor-based percentage calculation. Many come from Vedic math, an ancient system with 16 formulas for fast mental calculation.

How to square numbers ending in 5 instantly?

For any number ending in 5: multiply the first digit(s) by itself plus 1, then append 25. Example: 35² = 3×4 = 12, append 25 = 1225. Works for 45² = 4×5 = 2025, 75² = 7×8 = 5625, etc.

150+ Mental Math Tricks — Calculate Faster Than a Calculator

Multiply 2-digit numbers in seconds. Calculate percentages in your head. Square any number ending in 5 instantly. Free interactive practice with step-by-step breakdowns.

Multiplication Percentages Division Algebra Roots & Squares Speed Math

Loading Math Tricks...

Menu

⭐ Popular Tools

🕒 Recently Used

📁 All Categories

Quick Links

Support

150+ Mental Math Tricks — Calculate Faster Than a Calculator