Subtract Multiples of 10 and 100

**Let's Review**

**Multiples of 10** are numbers that end with a zero. They're made up of just Tens.

Are these multiples of 10?

10, 20, 30, 40, 70, 90, 100, 110, 130, 240, 360

Yes they are! They all end in a zero.

**Multiples of 100** are numbers that end with **two zeros.** Some examples are:

100, 200, 300, 500, 600, 700, 800, 900, 1100

Let's learn to subtract multiples of 10 and 100. They're both pretty easy to do 🤓.

Let's learn from an example:

What is 976 - 500?

Before you subtract, write the equation in **column form** first.

😀Tip: The larger number should be on top and the smaller number should be at the bottom.

Which column should you subtract first?

**👉 First,** subtract the **Ones.**

What digits are in the Ones place?

That's right! 6 and 0.

What's 6 - 0?

It's 6.

So, we'll write 6 in the Ones place.

**Next,** subtract the **Tens.**

Subtract 7 - 0. Did you get 7?

🤗Remember, **subtracting zero **from a number does not change anything.

Write 7 in the Tens place.

**Lastly**, subtract the **Hundreds.**

What is 9 - 5?

Great job! It's 4.

We'll write 4 in the Hundreds place.

So, 970 - 500 = **470**.

😀 Did you notice that the Tens and Ones did not change?

Yes, only the hundreds changed.

When we **subtract a multiple of 100 **from a 3-digit number, the Tens and Ones place do not change.

👉 Tip: You can just copy the Tens and Ones.

Then, go straight to subtracting the Hundreds.

It's easy, right?

**Subtracting a multiple of 10** from a 3-digit number is just like subtracting a multiple of 100.

**But **with just a small difference.

Let's look at an example.

We'll subtract from the same number.

But this time we'll take away 540 from it.

976 - 540 = ?

As always, we write that in **column form.**

**First,** we subtract the **Ones.**

What's our rule for subtracting a zero?

👉That's right! **Subtracting a zero **does not change the number.

So what is 6 - 0?

It's still 6! We'll write 6 in the Ones place.

**Next,** we subtract the **Tens.**

What is 7 - 1?

This is where it becomes different from subtracting multiples of 100.

Since we're not subtracting a zero, the answer will not be 7.

Yes! The answer is 3.

We'll write 3 in the Tens place.

**Finally,** we subtract the **Hundreds.**

9 - 5 is 4.

We'll write 4 in the Hundreds place.

So, 976 - 540 is **436**.

😀 This time, only the Ones place did not change.

Great job. You're getting better and better at subtraction!

Now, you can move on to practice. 💪

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