There is a easy way to subtract a number from the numbers that are of the format 100, 10000, etc. How to go about it, the rule is as follows

Rule:Subtract all the digits by 9 except last. The last has to subtracted by 10

For example: Subtract 456 from 1000. You can do it mentally as

Do like this

1. 9 – first digit (4) = 5

2. 9 – second digit (5) = 4

3. 10 – last digit = 4

The answer is 544, to check if it is correct add 456 + 544 = 1000

You can practice this quiz to practice and make the memory stronger for this concept

Maths tricks for subtraction

Practice the concept of easily subtracting a number from the numbers that are of the format 100, 10000, etc

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