# Lesson Video: Tens Mathematics • 1st Grade

In this video, we will learn how to model a ten as ten ones and to model multiples of ten using base ten blocks.

04:19

### Video Transcript

Tens

In this video, we will learn how to model a 10 as 10 ones and to model multiples of 10 using base 10 blocks. Here are some base 10 blocks. This tower is called a 10, and this is called a ones block. We can use base 10 blocks to help model numbers. We can use these 10s to help us model multiples of 10. There are three 10 blocks. Let’s count in 10s to find out what the number is. 10, 20, 30. 30 was made using three 10s. Let’s practice modeling numbers using base 10 blocks.

How many ones make a 10?

Let’s count. There’s one, two, three, four, five, six, seven, eight, nine, 10. 10 ones make a 10.

A number has been made from place value blocks. How many groups of 10 are there? What is the number?

In the first part of the question, we need to count the number of 10s there are in the model. Let’s count. One, two, three, four, five, six, seven. There are seven groups of 10.

What is the number? To find the number, we need to work out what seven 10s are. We could count forward in 10s seven times. Let’s count. 10, 20, 30, 40, 50, 60, 70. Seven 10s are 70. There are seven groups of 10, which makes 70.

What number is missing? 90 marshmallows equals what groups of 10?

In this question, we’re being asked how many 10s there are in 90. If there are 90 marshmallows, how many groups of 10 can we make? We could make the number 90 using place value blocks. 10, 20, 30, 40, 50, 60, 70, 80, 90. How many groups of 10 are there? One, two, three, four, five, six, seven, eight, nine. 90 marshmallows equals nine groups of 10. The missing number is number nine. We counted in 10s until we reached 90. Nine 10s made 90. The missing number is nine.

What have we learned in this video? We’ve learned that 10 ones make a 10 and how to model multiples of 10 using place value blocks.