When you multiply a number by 10, there’s a super easy trick you can use!

Rule

When you multiply a number by $10$, move the point in the number one place to the right.

Bootcamps

Want to watch animated videos and solve interactive exercises about multiplication by powers of ten? Click here to try Bootcamps!

There’s a special case you may come across: If the number you’re multiplying by $10$ isn’t a decimal number. In that case, there is always an invisible point behind the last digit. By moving the point one place to the right, you get a free place. You can fill this place with the digit $0$.

The trick of moving the decimal point when multiplying by 10, is similar to a trick you can use when dividing by 10.

Example 1

** **

- a)
$$61\cdot 10=610$$ - b)
$$\text{}763.4\text{}\cdot 10=\text{}7634\text{}$$ - c)
$$20\cdot 10=200$$ - d)
$$\text{}0.4\text{}\cdot 10=4$$ - e)
$$65\cdot 10=650$$ - f)
$$\text{}36.98\text{}\cdot 10=\text{}369.8\text{}$$ - g)
$$71\cdot 10=710$$ - h)
$$\text{}0.04\text{}\cdot 10=\text{}0.4\text{}$$

Previous entry

Which Products Give the Answers in the Times Tables?

Next entry

How to Multiply by 100