Question

A bakery uses 63.9 kilograms of flour each hour. How many kilograms of flour will the bakery use in 18 hours?

Answer 1

`1,150.2` kilograms

Explanation:

In word problems, you need to decide which operation is it?

Addition, subtraction, multiplication or division.

We can do this by addition, because each hour, more flour is used:

`63.9 +63.9+63.9+ ..........63.9` until we have added 63.9 eighteen times.

However, multiplication is the short form of repeated addition.

`7+7+7+7+7+7 = 6xx7 = 42`

In this case: `63.9 xx 18`

You can do long multiplication:

`color(white)(xxx)63.9`
`color(white)(xx)ul(xx18)`
`color(white)(xxl)5112`
`color(white)(xxl)ul6390`
`color(white)(lll)ul1150.2`

Or you can use the distributive law

`63.9xx (20-2)`

=`1278 - 127.8`

`=1150.2`