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Trick 4 : A quick way to square numbers that end in 5

on July 21, 2014

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A quick way to square numbers that end in 5

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Trick 99 - Squaring special numbers (5 and repeating 6's)

Squaring special numbers (5 and repeating 6's) . Choose a number with a 5 and repeating 6's. The square is made up of: first digits: 32 & two fewer 1's than repeating 6's next digits: 03 & one fewer 5 than repeating 6's last digit: 6 Example: ...

Trick 105 - Squaring special numbers (7 and repeating 9's)

Squaring special numbers (7 and repeating 9's) . - Choose a number with a 7 and repeating 9's (use a mimimum of three 9's). The square is made up of: first digits: 63 & two fewer 9's than repeating 9's in the number next digits: 84 & one fewer 0 than repeating 9's in the number last digit: 1 ...

Trick 112 - Multiplying two 2-digit numbers (same 1st digit, 2nd digits sum to 10)

Multiplying two 2-digit numbers (same 1st digit, 2nd digits sum to 10) . - Both numbers should have the same first digit. Choose second digits whose sum is 10. Multiply the first digit by one number greater than itself; this number will be the first part of the answer: X X _ _. Multiply the two second digits together; the product will be the last part of the answer: _ _ X X. N...

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Trick 4 : A quick way to square numbers that end in 5

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