To multiply an even number by 25, reduce the number to half twice and add two zeroes at the end of the resultant number. Remember, this works only if there is no decimal point in the number after reducing it to half both times.
For example: Let’s take 64 × 25Reduce 64 to half. We get 32.Again, reduce 32 to half. We get 16.Now, add two zeroes at the end of 16. We get 1600.So, 64 × 25 = 1,600Try these at home: 88 X 25 = _____36 X 25 = _____68 X 25 = _____
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