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Master Subtraction

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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★ Count Up (Addition approach)

Instead of taking away, think of the distance between the two numbers. Count up to the nearest 10, then to the target.

Example

42 - 35: From 35 to 40 is 5. From 40 to 42 is 2. 5 + 2 = 7

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★ Subtract in Parts

Break the number being subtracted into units and tens. Subtract the units to hit a round ten, then subtract the rest.

Example

24 - 7: 24 - 4 = 20, 20 - 3 = 17

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★ Rounding Compensation

Subtract a clean multiple of 10 that is slightly larger, then add back the difference.

Example

63 - 28: Pretend it's 63 - 30 = 33. Since you subtracted 2 too many, add 2 back: 33 + 2 = 35

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★ Same Difference

The difference between two numbers doesn't change if you shift them both by the same amount. Shift them so the second number ends in 0.

Example

42 - 18: Add 2 to both. (42+2) - (18+2) -> 44 - 20 = 24

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★ Borrowing from Zeroes

When subtracting from numbers like 1000, subtract 1 from both to avoid complex borrowing.

Example

1000 - 346: Subtract 1 from both -> 999 - 345 = 654

🧠 Table Practice

Device-only practice sets. Your last score is stored only in this browser.

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Subtraction Mixed (1-10)

Subtraction Mixed (11-20)

Subtraction Mixed (21-30)

Subtraction Mixed (31-40)

Subtraction Mixed (41-50)

Subtraction Mixed (51-60)

Subtraction Mixed (61-70)

Subtraction Mixed (71-80)

Subtraction Mixed (81-90)

Subtraction Mixed (91-100)

Subtraction Mixed (1-100)

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