Speed Maths — Concept, Formulas & Examples
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Multiplication Tricks
Multiplication with 5, 25 & 125
Instead of multiplying with 5, multiply with 10 and then divide by 2.
Instead of multiplying with 25, multiply with 100 and then divide by 4.
Instead of multiplying with 125, multiply with 1000 and then divide by 8.
Multiplication with 11
Assume a zero at the beginning and at the end of the number. Now add two digits at a time starting with right most two digits and write them as single digit integer. Carry forward if there is any.
Solution:
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Solution:
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Multiplication with 99
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Solution:
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Calculating Squares
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