Lesson Video: Making Two-Digit Numbers With Tens and Ones Mathematics • 1st Grade

In this video, we will learn how to use place value equipment to make two-digit numbers with tens and ones.

06:31

Video Transcript

Making Two-Digit Numbers with Tens and Ones

In this video, we will learn how to use place value equipment to make two-digit numbers with tens and ones. The number 33 is a two-digit number. Two-digit numbers have a tens digit and a ones digit. The tens digit in the number 33 is worth three 10s. We can show this using three 10s blocks. 10s blocks are made using 10 bricks. To show three 10s, we need three 10s blocks.

The number 33 has three ones. We can show this using three ones bricks. Three 10s are 30. 10, 20, 30. And our three ones blocks are worth three. So, we can model the number 33 using three 10s blocks, which are worth 30, and our three ones. 30 and three makes 33. 10, 20, 30, 31, 32, 33. Let’s practice using place value equipment to make two-digit numbers with tens and ones.

What is the number? 45, nine, or 54.

To help us find the number, we need to count the number of 10s and ones it has. Let’s start by counting the number of 10s. One, two, three, four. So, we need to write the digit four in the tens place. Now, let’s count the ones. One, two, three, four, five. So, we need to write our five digit in the ones place. Which two-digit number have we made? 45, nine, or 54? It’s number 45.

Four 10s are worth 40. 10, 20, 30, 40. And five ones are five. 40 plus five makes 45. The number is number 45.

Find the missing part. Is it five, 50, or eight?

We’re shown a part–whole model. The number 85 is the whole number. It’s a two-digit number. It has a tens digit and a ones digit. This part of the number is the tens part. The number 85 has eight 10s. We can model eight 10s using eight 10s blocks. Let’s count in 10s. 10, 20, 30, 40, 50, 60, 70, 80. The eight digit in the number 85 is worth 80. And the five digit in the number 85 is worth five ones. 80 plus five is 85.

The missing part of the number is five. 85 has eight 10s, which are worth 80, and five ones.

Find the missing part. 72 what two. Is it 70, seven, or 700?

We’re shown a part–whole model. The whole part is the number 72, which is a two-digit number. It has a tens part and a ones part. The missing part is the tens part. So we need to work out how many 10s there are in the number 72. We already know that 72 has two ones. Is the missing part 70, seven, or 700?

We already know the two digit is worth two ones. And we also know that the number 72 has a seven digit, which is its tens digit. We might think that the missing number is seven, but it’s not. We have to think about what seven 10s are worth. Here are seven 10s. Let’s count in 10s to find out what they’re worth. 10, 20, 30, 40, 50, 60, 70.

The missing part of the number is 70. 72 is made up of seven 10s, which are worth 70, and two ones.

What have we learned in this video? We’ve learned how to use place value equipment to make two-digit numbers with tens and ones.

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