Subtract Two 2-digit Numbers - Within 100

To subtract two digit numbers, first align the numbers so that place values are lined up.

Subtract ones regroup if needed and then subtract tens.

For example: Let's find the difference of 45 and 16.

Align the numbers and subtract ones. Regroup if needed.

	3	15
	4	5
–	1	6

9

 

Now, subtract the tens.

	3	15
	4	5
–	1	6

2

9

 

The difference of 45 and 16 is 29.