To multiply any two digit number by 9
Hello children, in an earlier column we learned how to multiply the numbers from 12 to 20 by 9. Now we shall learn a general method to multiply any two-digit number (11 to 99) by 9.
Take a two-digit number, say 24
The problem is 24 X 9 =?
Step 1: Add 1 to the first digit (tens digit) 2 + 1 = 3
Step 2: Subtract the answer from the given number 24 – 3 = 21 This is the first part of your answer
Step 3: Subtract the last digit (units digit) from 10 10 – 4 = 6 This is the second part of your answer 24 X 9 = 216
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