Subtraction With Regrouping

Contributor: Ashley Nail. Lesson ID: 13416

Have you ever visited a farmer's market? There are so many fruits and vegetables, but sometimes you have to regroup. Learn how to subtract with borrowing and regrouping!

categories

Arithmetic

subject
Math
learning style
Visual
personality style
Lion, Beaver
Grade Level
Primary (K-2), Intermediate (3-5)
Lesson Type
Quick Query

Lesson Plan - Get It!

Audio:

Imagine you work at a farmer's market. Every Saturday, your family sets up a booth and sells tomatoes, cucumbers, watermelons, squash, and onions.

At the end of the day, you have to figure out how many of each vegetable you have left.

cucumbers

For example, you started the day with 47 cucumbers. You look at the receipts and notice you sold 31 cucumbers. How many cucumbers do you have left over?

  • What math operation will you use to solve this problem?

  • How will you figure out how many cucumbers are left over?

If you thought subtraction, you are correct!

We use subtraction because you start with a total number, take some away, and end with a smaller amount than you started with.

For this type of subtraction problem, set it up to look like this:

47 - 31

Place the starting total (47) on the top and subtract (31) below. Make sure that the numbers in the tens place and ones place line up.

Next, subtract the ones:

7 - 1 = 6

Then, subtract the tens:

4 - 3 = 1

And you have an answer: 16 cucumbers left over!

47 - 31 = 16

Now, let's look at the tomatoes.

tomatoes

You started the morning with 32 tomatoes. You sold 15.

  • How many tomatoes do you have left over?

Let's set up the subtraction problem the same way. The total is the top number, and the number we are subtracting goes below. The numbers in the tens place and the ones place are lined up:

32 - 15

First, see if you can subtract the ones place:

2 - 5 ← You cannot take 5 away from 2.

We need to regroup!

When there are not enough ones to take away from, you have to borrow from the tens place. The borrowed group of ten will be regrouped and changed into ones.

Look at the number 32. In this number, there are 3 tens. In order to regroup, we will borrow a ten to regroup into ones:

regroup the 3 tens

When we borrow a ten to regroup, we no longer have 3 tens. Now, there are 2 tens:

2 tens

Now, let's regroup that borrowed ten into ones:

regroup into ones

We no longer have only 2 ones. Now we have 12 ones!

12 ones

Let's see if we can subtract now! Start with the ones:

12 - 5 = 7

Because we regrouped a ten, there are now enough ones to take away 5!

Next, subtract the tens. Remember, there are only 2 tens now because we regrouped:

2 - 1 = 1

Great! Now we have an answer!

32 - 15 = 17

There are 17 tomatoes left over after the farmer's market.

Review what you just learned with Subtraction with Regrouping - Math Video for 2nd Grade from Math & Learning Videos 4 Kids:

  • Ready to practice regrouping on your own?

Move on to the Got It? section to practice the steps to subtract with regrouping!

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