## 4. Multiplying by 10 or 100

To multiply by 10, do the opposite of what we did when dividing. Move the decimal place one spot to the right of that number. If there is no number when you move the decimal point, if there is no number to the left of that decimal point, add zero in the space. To multiply by 100, move the decimal palace two spots to the right of that number.

Example: **679.2 x 10** **= ?**

**Step 1**: 6792.

Therefore the answer is 6,792

What if there is no number to the left of the decimal point after moving it?

Example: **679.2 x 100 = ?**

**Step 1**: 6792_.

**Step 2**: 67920.

Therefore the answer is 67,920

**Now you try**: What is 54.7 x 10? What is 54.7 x 100?