Question

Carlos spent 1 1/4 hours doing his math homework. He spent 1/4 of this time practicing his multiplication facts.

How many hours did Carlos spend practicing his multiplication facts?

Answer 1

18.75 minutes or 0.3 (3/10 or almost 1/3)

Explanation:

Carlos spent
`1(1)/(4)`hours doing math. If an hour is 60 minutes, this means he spent 60 minutes and 1/4 of 60 minutes which is 15 minutes. In total he spent 75 minutes on math.

We also know he spent 1/4 of that 75 minutes on multiplication facts. How long did he spend?

We will multiply by the two quantities to find the amount.

`(1)/(4) (75)=(75)/(4) = 18.75 minutes`

We will convert this back into hours by dividing it by 60 minutes since 60 minutes= 1 hour.

`(18.75)/(60) =0.31`

He spent 0.3 or 3/10 or about 1/3 of his time on multiplication facts.