Which property: 9 + 0 = 9

Step by step, with the reason for every step · Number properties for mental math · Foundations

Step by step

Question: which property is this: 9 + 0 = 9?

9 + 0 = 9

Look at both sides.

Adding 0 changes nothing.

adding 0 changes nothing

So it is the identity property of addition.

= identity property of addition

Let's check: work out both sides.

The left side is 9.

The right side is 9.

Both the same.

So the answer is right!

9 + 0 = 9, 9 = 9

Let's look back.

First: compare the two sides.

Last: check.

Answer

= identity property of addition

Try this one yourself, then check:

Which property is this: 4 + 0 = 4

Show the answer

identity property of addition