Quickly find percentages

Quickly find percentages
*. To find out the 15% of a number, divide it by 10 andthe add half of it.
*. To find out the 20% of a number, divide it by 10 andmultiply the result by two.
*. To find out the 5% of a number, divide it by 10 andthe divide it by two.

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Multiplying by 11

Multiplying by 11 is easier when adjusting the rule for multiplying by 9. Just think of11 as (10+1) So 436 × 11 = 4360 + 436 = 4796…that’s the simpler way of explaining why the digits add up to each other like youwrote: 4360 + 436 —– 4796
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Square any two digits number that ends with 5

Square any two digits number that ends with 5 Calculating the square of a number below 100 is extremely simple. If you wantto find the square of 25 for example, you simply have to take the first digit (2), multiply it for the next highernumber (3), and then add 25 to the result. For example 1). 25*25 now, (2*3)25=625 2). 75*75 now, (7*8)25=5625
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How to multiply any two digits number by 11

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