Cool Math Tips, shortcuts, quick Mathematical Tricks

1. Any Square....

Assume you want to find 87². Find a simple number nearby - a number whose square could be.....

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2. Product of 10a + b a...

compute 113?—117, where a = 11, b = 3, and c = 7. First compute 11?—(11 + 1) = 1.....

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3. Faster Subtraction...

Subtraction is often faster in two steps instead of one. For example, 427 - 38 = (427 .....

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4. Faster addition, #2...

It's often faster to add a digit at a time starting with higher digits. For example, 583 .....

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5. Multiply then subtra...

When multiplying by 9, multiply by 10 instead, and then subtract the other number. For exa.....

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6. Adding a Long List o...

For some people, adding a list of not very different numbers is a frequent task. To me thi.....

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7. Multiply Up to 20X20...

Take 15 x 13 for an example. Always place the larger number of the two on top in your min.....

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8. Adding the digits of...

If the number selected is 1111: Square the number: 1111 ?— 1111 = 1234321 Add the d.....

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9. Memorizing Addition ...

Memorizing Addition : Tips & Tricks 1. First, start with the doubles: 1+1, 2+2, etc, all .....

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10. Add and subtract...

when you're in a shop and there's lots of prices like £3.99, £9.99 etc. then you can rou.....

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