Subtracting One-Digit Numbers from Two-Digit with Regrouping

Kellyhas 25crayons. Shegives 8to Patrice. How many crayons does Kellyhave left?

How can we figure this out? 🤔

We subtract!

When we subtract a one-digit number from a two-digit number, we start by **stacking the numbers vertically**.

This is called the **column form.**

The larger number is always on top.

When we subtract, we subtract the Ones first.

Can we subtract 5 - 8?

❎ No!

👉 We have to **regroup.**

How do we do this?

Let’s look at the counters for **25 **and **8:**

We can take one of the Tens in 25, and break it up into 10 Ones.

We add the 10 Ones to the Ones place.

We now have 1 Ten and 15 Ones.

Now, we can subtract the Ones!

What's 15 - 8?

It's 7. We write that in the Ones column.

Now, we subtract the Tens.

There's no digit below 1, so we just bring it down.

We get 17.

Kelly has 17 crayons left. 🎉

Regroupingis changing the grouping of numbers. This lets us take some value from one digit and give it to another digit that needs more.

Let’s try another one.

62 - 5 = ?

Start by writing the numbers in **column form**.

We cannot subtract the numbers in the Ones place.

First, we need to borrow 1 Ten from 6 Tens.

1 Ten is 10 Ones.

We add the 10 Ones we borrowed to the Ones place.

Now, we have 5 Tens and 12 Ones.

We can subtract the Ones now.

What's 12 - 5?

Now, we subtract the Tens.

Since there's no digit below 5, we just bring it down.

The answer is 57.

You got it! 💪

Excellent work! 👌 Now, you can move on to practice!

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