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Today, we are going to continue to learn how to subtract fractions.

Have a look at the in focus question below.

What is the important information in this problem? What does mass mean?

Which is heavier? The rice or the flour? How do you know?

In order to calculate the subtraction, we need to make sure our denominators are the same. How can we do this?

Can 2/3 be made into twelfths?

Well done, you can make this into twelfths by multiplying the numerator and denominator by 4.

You should have now made the fraction 8/12.

We know that 8/12 – 5/12 = 3/12.

Can we simplify this even further?

That’s right. In its simplest form this would be ¼.


Still image for this video

Now complete this subtraction. Again change the denominator so it is the same.

What answer did you get?

Well done if you got 5/10.

Can you make this any smaller? Can it be simplified?

Now try the Guided Practice section then complete worksheet 13 which will be sent to you on Seesaw.