Lesson Video: Subtracting Two-Digit Numbers without Regrouping Mathematics • 1st Grade

In this video, we will learn how to subtract a two-digit number from a two-digit number without crossing a ten and model this with place value equipment.

08:54

Video Transcript

Subtracting Two-Digit Numbers without Regrouping

In this video, we will learn how to subtract a two-digit number from a two-digit number without crossing a 10 and model this with place value equipment. Here’s a two-digit number, 67. And we have to subtract another two-digit number, 53. The first thing we need to do is to model the number we’re subtracting from. The number 67 has six 10s and seven ones. Our second step is to subtract the ones. When we’re subtracting a two-digit number from a two-digit number, we always subtract the ones first.

We’re subtracting 53 from 67. And the number 53 has three ones. So let’s subtract three ones from our seven ones. One, two, three. Seven take away three leaves us with four ones. Our final step is to subtract the tens. We know that 67 has six 10s, and we have to subtract five 10s because the number 53 has five 10s. One, two, three, four, five. Six 10s take away five 10s leaves us with one 10. 67 subtract 53 equals 14.

Let’s recap what we’ve learned so far. When we’re subtracting a two-digit number from a two-digit number, first we model the number we’re subtracting from. Next, we subtract the ones. Then we subtract the tens. Let’s practice what we’ve learned about subtracting two-digit numbers from two-digit numbers by answering some questions now.

We can think about place value to help us subtract. Pick the correct way to decompose 58 into tens and ones. Subtract 26 from 58 by taking away six ones and then two 10s.

In this question, we have to subtract 26 from 58. And we’ve been given some models to help us. When we’re subtracting a two-digit number like 26 from another two-digit number like 58, it helps if we start by modeling the number we’re taking away from. In this case, we need to model the number 58. Only one of our models is correct. How could we decompose or break apart the number 58 into tens and ones correctly? It must be the second model. It has a five in the tens place and an eight in the ones place. The model shows five 10s, 10, 20, 30, 40, 50, and eight ones. So this is the correct way to decompose 58 into tens and ones.

We can also use this model to help us subtract. We’ve modeled the number we’re taking away from, which is 58. Now we can subtract 26. We always start by subtracting the ones first. We have eight ones in the number 58, and we need to subtract six. Eight ones take away six ones leaves us with two ones. Next, we need to subtract the tens. We know the number 58 has five 10s. And we need to subtract two 10s. The number 26 has two 10s. We had five 10s. We’ve subtracted two 10s. We have three 10s left. 58 subtract 26 equals 32.

When we’re subtracting a two-digit number from a two-digit number, the first step we can do is to model the number we’re subtracting from. This is the correct model to show the number 58. When we’re subtracting a two-digit number from a two-digit number, we always start by subtracting the ones first. Then we subtract the tens. 58 subtract 26 equals 32. We used our knowledge of place value to help us subtract.

Find the result of the following: 96 subtract 63 equals what.

In this question, we’re subtracting a two-digit number from a two-digit number. We can use place value equipment to help us model the number 96 because this is the number we’re subtracting from. The number 96 can be modeled using nine 10s and six ones. Now that we’ve modeled the number we’re subtracting from, our next step is to subtract the ones.

We have six ones, and we need to subtract three. One, two, three. Six take away three leaves us with three ones. Our next step is to subtract the tens. 96 has nine 10s, and we need to subtract six. Nine 10s subtract six 10s leaves us with three 10s. 96 subtract 63 equals 33.

We used our knowledge of place value to help. First, we modeled the number we were subtracting from. We subtracted the ones first and then the tens. 96 subtract 63 equals 33.

24 subtract 11 equals what.

In this question, we’re subtracting a two-digit number from a two-digit number. And we know that two-digit numbers have a tens and a ones digit. When we’re subtracting a two-digit number from a two-digit number, it helps if we start by modeling the number we’re subtracting from. We’re subtracting from the number 24, which has two 10s and four ones.

Now we can start by subtracting the ones. We know that 24 has four ones and 11 has one. So we need to subtract one from our four ones. Four take away one leaves us with three ones. Next, we need to subtract the tens. 24 has two 10s, and we need to take away one 10. One 10 take away one 10 leaves us with one 10. 24 take away 11 equals 13.

We used our knowledge of place value to help us subtract. First we modeled the number we were subtracting from. Then we subtracted the ones. And finally, we subtracted the tens. 24 subtract 11 equals 13.

What have we learned in this video? We’ve learned how to subtract a two-digit number from a two-digit number using place value equipment. We learned how to model the number we’re subtracting from. We also learned that first we subtract the ones and then we subtract the tens.

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