Unit D

What Do I Need to Know About Ones and Tens to Use Strategies to Solve Facts Within 20?

Place Value:

Numbers, such as 64, have two digits. Each digit is a different place value.

The left digit is the tens’ place. It tells you that there are 6 tens.

Therefore, there are 6 sets of 10, plus 4 ones in the number 64.

The last or right digit is the ones’ place which is 4.


|__ones’ place

|_________tens’ place


Now, can you think of another way to show this number?  What if I said you could only use 5 tens? How many ones would you use to show the number 64?


The video link below explains how to regroup ones as tens.

Regroup Tens as Ones

In the link below you will see a short video explaining place value with the number 25.

Place Value