Unit 13 – Working with fractions
Adding fractions
1 We can easily add fractions with like denominators.
4 5
1
1 3
1 3
1 3
1 5
1 5
1 5
1 5
3 5
1 3
What is three-fifths add one-fifth? 3 _ 5 + 1 _ 5 = 4 _ 5 1 _ 5 + 3 _ 5 = 4 _ 5 Three-fifths plus one- fifth equals four- fifths.
What is two-thirds add one-third? 2 _ 3 + 1 _ 3 = 3 _ 3 or 1 1 _ 3 + 2 _ 3 = 3 _ 3 or 1 Two-thirds plus one- third equals three- thirds, which is the same as one whole.
2 We can also show adding on a number line.
2 8
+
0
1
1 8
2 8
3 8
4 8
5 8
6 8
7 8
3 _ 8 + 2 _
8 = 5 _
8 so 5 _
8 is the sum of the smaller fractions 3 _
8 and 2 _ 8 .
Use the number line to show that 4 _ 8 + 2 _ 8 = 6 _ 8 .
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03/05/2022 10:20
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