Convert 90 minutes to hours Step by Step

Step by step

The question

Question: change 90 minutes into hours.

90 min = ? h

1 Find the link

1 hour is 60 minutes.

1 h = 60 min

2 Make the unit fraction

We want hours, so hours go on top.

We have minutes, so minutes go at the bottom.

Top and bottom are the same amount.

So the fraction is 1, and times 1 keeps the size.

1 h60 min = 1

Careful!

Not upside down.

Then the minutes would not cross out.

Careful: not 90 min × 60 min1 h ✗

3 Multiply

We multiply 90 minutes by the fraction.

90 min = 90 ~~min~~ × 1 h60 ~~min~~

Minutes on top and at the bottom cancel, like numbers.

Cross them out.

Hours are left.

What is left: 90, divided by 60.

= 9060 h

90 divided by 60 is 1.5.

So 90 minutes is 1.5 hours.

= 1.5 h

4 Check

Does it make sense?

Hours are bigger than minutes.

So we need fewer of them.

1.5 is less than 90.

Yes.

h bigger than min → fewer: 1.5 < 90

And back the other way: 1.5 times 60 = 90.

We get 90 minutes again.

So the answer is right!

back: 1.5 × 60 = 90

Let's look back.

First: find the link.

Then: make the unit fraction.

Then: multiply.

Last: check.

Answer