Lesson Video: Place Value of Two-Digit Numbers Mathematics • 1st Grade

Video Transcript

Place Value of Two-Digit Numbers

In this video, we will learn how to represent numbers up to 100 in place value tables or charts and say the value of each digit.

Zero is a digit, so is one, two, three, four, five, six, seven, eight, and nine. If we put two digits together, we make a two-digit number. We used the digits three and eight to make a two-digit number. Do you know what the number is? It’s the number 38. If we swap the digits around, we can make a different two-digit number. Which number have we made? It’s number 83.

You can tell the value of each digit in a two-digit number by its place. Let’s look again at the number 38. The three digit is worth three 10s. And the eight digit is worth eight ones. How much are three 10s worth? 10, 20, 30. So, the three digit is worth 30.

The eight is in the ones place. It’s worth eight ones. 30 and eight makes the number 38. What happens if we swap the digits around? This time, the eight digit is worth eight 10s. 10, 20, 30, 40, 50, 60, 70, 80. The eight digit is worth 80. Eight 10s are 80. The three digit is in the ones place in the place value chart, which means it’s worth three ones. Eight 10s and three ones makes 83.

You can tell the value of a digit in a two-digit number by its place. This three digit is worth three 10s. And the eight digit is worth eight ones. The eight digit in this number is worth eight 10s. 10, 20, 30, 40, 50, 60, 70, 80. The eight digit is worth 80. And the three digit is worth three ones or three.

Let’s practice reading numbers up to 100 in place value tables and saying the value of each digit. Remember, two-digit numbers have two digits, a tens digit and a ones digit.

What number does the table show.

We’re a given a place value table. There’s a five digit in the tens place and a two digit in the ones place. Five 10s are worth 50. 10, 20, 30, 40, 50. So, we know the five digit is worth 50. The two digit is worth two ones. 50 and two makes the number 52. The number shown in the table is the number 52.

Isabella made a number in this place value chart. Her number has zero ones. How many groups of 10 does her number have? Which place value chart shows the number she made?

Isabella has made a number in this place value chart. And the question tells us that her number has zero ones. The first part of the question asks us how many groups of 10 her number has. In other words, how many 10s are there in the tens place? Let’s count them. One, two, three, four, five, six, seven. We know that seven 10s are worth 70.

The question tells us that Isabella’s number has zero ones. Isabella has made the number 70. Which of the place value charts shows seven 10s and zero ones. It’s not the first place value chart because it has zero 10s and seven ones. The digits in this place value chart are the wrong way round. This place value chart has seven 10s and zero ones. This is the number 70. So, this is the correct place value chart. This place value chart has seven 10s and seven ones. But Isabella’s number has zero ones.

Isabella made the number 70. The place value chart which shows the number she made is the one in the middle. Seven 10s and zero ones makes the number 70.

Find the value of the underlined digit in the number 62.

We can use a place value chart to help us answer this question. The six digit in the number 62 is in the tens place. 62 has six 10s. Six 10s are 60. So, the six digit in the number 62 is worth 60. The two digit is in the ones place, so it’s worth two ones. The underlined digit in the number 62 is worth two ones.

What number am I? I have two digits. I have zero ones. I have a nine in the tens place.

In this question, we’re given some clues about a mystery number. The first clue tells us that this is a two-digit number. So, we can use a place value chart to help. Our second clue tells us that the mystery number has zero ones. So, we can write a zero in the ones place. Our final clue tells us that the mystery number has a nine in the tens place. So, let’s write a nine in the tens place on the place value chart.

What number have we made? It’s the number 90, nine 10s and zero ones. The mystery number is 90.

What are the greatest and smallest two-different-digit numbers that can be made with the digits nine, four, and three?

In this question, we’re being asked to make two numbers using the digits nine, four, and three. We could use digit cards to help. We have to find the greatest and the smallest two-digit numbers we can make. The question also tells us that the digits have to be different in our two-digit numbers. This means that we can’t use the same digit twice in a number. Each of our numbers has to have two different digits. Let’s use place value charts to help.

What is the greatest number we could make with the digits nine, four, and three? We know greatest means the number with the most value. Which digit could we put in the tens place to make the greatest number? Nine, four, or three? We should put the nine digit in the tens place because this is the digit which has the greatest value. Nine 10s are 90.

Which digit should we position in the ones place? Which is worth more? Four or three? Four is worth more than three. So, the greatest number we can make with the digits nine, four, and three is the number 94. Nine 10s are worth 90. Four ones are worth four. 90 and four makes 94.

What’s the smallest two-digit number we could make with the digits nine, four, and three? Remember, we can’t use the same digit twice in this number. Which of our three digits has the least value? Nine, four, or three? We need to put the digit with the least value in the tens place in the chart. The digit with the least value is three. Three 10s are worth 30. 10, 20, 30. Three 10s are less than four 10s or nine 10s.

Which of our remaining digits is worth the least? Is it nine or four? Four is worth less than nine. Three 10s are worth 30. Four ones are worth four. 30 and four makes 34.

We used the digits nine, four, and three to make the greatest and smallest two-different-digit numbers. The greatest number is 94, and the smallest number is 34.

What have we learned in this video? We’ve learned that two-digit numbers have a tens digit and a ones digit. We’ve also learned how to use a place value chart to help us understand the value of each digit.