In this activity, we will be multiplying numbers by 10 or 100.

To multiply a whole number by 10: move each digit **one place to the left**, then fill any empty places with zero.

43 × 10 = 430

654 × 10 = 6540

70 × 10 = 700

To multiply a whole number by 100: move each digit **two places to the left**, then fill any empty places with zero.

43 × 100 = 4300

60 × 100 = 6000

542 × 100 = 54200

Let's try some examples together.

**Example 1**

Multiply 65 by 10.

**Answer**

To multiply by 10, each digit moves one place to the left.

In 65, we have 6 tens and 5 ones.

The **6 tens** becomes worth **6 hundreds. **

**T**he **5 ones** becomes worth **5 tens**.

We fill the ones place with zero as a placeholder.

**65 × 10 = 650**

**Example 2**

Multiply 24 by 100.

**Answer**

To multiply by 100, each digit moves two places to the left.

In 24, we have 2 tens and 4 ones.

The **2 tens** becomes worth **2 thousands.**

The **4 ones** becomes worth **4 hundreds. **

We fill the ones and tens places with zeros as placeholders.

**24 × 100 = 2400**

Now that you know how to multiply by 10 and 100, you are ready to try the next 10 questions.