# How do you multiply #0.31*69#?

##### 2 Answers

Mar 24, 2016

#### Explanation:

If you are calculating it in your head, you might be best off doubling

#69 -> 138 -> 276 -> 552 -> 1104 -> 2208 -> 2139 -> 21.39#

There will be different approaches. All as effective as each other. Here is another one

21.39

#### Explanation:

Consider

So