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S1 w/c 25th JanTask 1: Dividing by a unitary fraction.

A unitary fraction is a fraction where the numerator is 1. e.g. 1/3, /17 … not 2/7 or 5/7.

Example 4 ÷ 1/3 … means how many thirds make 4 wholes … well, draw out lots ofthirds … and how many do you need to make 4 wholes? … the answer is 12

Example 2 ÷ 1/5 … means how many fifths make 2 wholes … so draw out lots of fifths…a nd how many will you need to make 2 wholes? … the answer is 15.

Now try these:

Task 2: Multiplying a fraction by a whole number.

Example: 3 × 2/5 … means three lots of two-fifths … so two-fifths + two-fifths + two-fifths … which would be six fifths … which is 6/5 or 1 1/5.

Example 4 × 3/4 … means 4 lots of 3/4 … so 3/4 + 3/4 + 3/4 + 3/4 … which is 12/4 …which is 3 wholes!

Now try these:

Task 3:

These are similar to Task 1 … but harder!!

Task 4:

These are similar to Task 2 … but harder!

I’ll post some answers later in the week.

Segar

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