Page 193 - Math Smart - 7

i CHAPTER 8.5

Adding and Subtracting In this chapter

Pupils should be able to:
• add and subtract two
Fractions simple fractions
• find fractions of
___
quantities {whole
8.5.1 Adding and subtracting like number answers)

fractions

Fractions can be added and subtracted easily if they have the same denominators.

Example 1

Add ^ and |

Solution
1
5

m

1 fifth + 3 fifths = 4 fifths The bar diagram has
5 equal parts. We add
1 +3
i ^
5 ^ 5 5 1 part and 3 parts.

Example 2

Subtract |
and
|
Solution
take away |

We add or subtract like
fractions by adding
7 eighths - 3 eighths = 4 eighths
or subtracting their
Z _ 3 _ 7^ _ 4 _ 1
8 8 ~ 8 "8"2 numerators.