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Master Addition
Learn the secrets of rapid mental computation used in competitive exams. These strategies will help you bypass traditional paper-and-pencil methods.
➕ Addition ➖ Subtraction ✖️ Multiplication ➗ Division x² Squaring xⁿ Exponentiation √ nth Root % Percentage △ Pythagorean Triples lcm LCM hcf HCF
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★ Make 10s
Scan for numbers that add perfectly to 10 (or multiples of 10) to simplify the sum before adding the rest.
Example
8 + 5 = 8 + 2 + 3 = 10 + 3 = 13 ➕
★ Left-to-Right Addition
Instead of the traditional right-to-left method, add the largest place values (tens) first, then the units. This keeps the running total in your head.
Example
45 + 23: 40+20=60, 5+3=8, so 60+8=68 ➕
★ Break Apart
Keep the first number intact and split the second number into tens and units to add them sequentially.
Example
38 + 17 = 38 + 10 + 7 = 48 + 7 = 55 ➕
★ Rounding Compensation
If a number is close to a multiple of 10, round it up, add it, and subtract the difference. Very useful for numbers ending in 8 or 9.
Example
49 + 36: Round 49 to 50. Add 50 + 36 = 86. Subtract the 1 you added = 85 ➕
★ Left-to-Right (Hundreds)
For large numbers, add the hundreds, then the tens, then the units. It requires less short-term memory.
Example
345 + 412: 300+400=700, 40+10=50, 5+2=7. Total = 757 ➕
★ Anchor to Hundreds
Borrow from one number to make the other a clean hundred, simplifying the calculation drastically.
Example
295 + 138: Give 5 from 138 to 295. Now it's 300 + 133 = 433 🧠 Table Practice
Device-only practice sets. Your last score is stored only in this browser.
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