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Subtraction

In picture 'A' there is one flower and in picture 'B', the flower is taken away. That means from 1 if we take 1 we will be having 0. Removing some items from a group of objects and counting the remaining, is called subtraction. We write it as:

1 - 1 = 0
2 - 1 = 1
3 - 1 = 2
4 - 1 = 3

Similarly for others.

As you subtract the object, quantity of the object decreases.