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b.

+ =

c.

+ =

Adding Zero (0)

There is no bird 4 birds come to sit on How many birds are

on the tree. the tree. there on the tree now?
Clearly, 4.

So, 0 + 4 = 4.

Similarly, 4 + 0 = 4

When we add any number to zero or zero to any number, we get the
same number.

Adding one (1)

There are four birds One more bird comes How many birds are there
on a tree. to sit on the tree. on the tree now?

Clearly, 5.

So, 4 + 1 = 5
Also, 1 + 4 = 5

Thus, there are 5 birds on the tree now.
When we add 1 to a number or a number to 1, we get the number that

comes just after that number.

36 Mathematics 1