Find the sum of: (a) − 3 11 , − 1 4 and 5 8 (b) − 5 9 , − 7 12 and 11 18 [2 MARKS]

: Each part: 1 Mark (a) − 3 11 + − 1 4 + 5 8 − 3 × 8 88 − 1 × 22 88 + 5 × 11 88 − 24 − 22 + 55 88 − 46 + 55 88 = 9 88 (b) − 5 9 + − 7 12 + 11 18 − 5 × 4 36 − 7 × 3 36 + 11 × 2 36 − 20 − 21 + 22 36 = − 19 36

Find the sum of: (a) −311,−14 and 58 (b) −

Question

Find the sum of:
(a)

\frac{- 3}{11}, \frac{- 1}{4}

and

\frac{5}{8}

(b)

\frac{- 5}{9}, \frac{- 7}{12}

and

\frac{11}{18}

[2 MARKS]

Answer:
:
Each part: 1 Mark
(a)

\frac{- 3}{11} + \frac{- 1}{4} + \frac{5}{8}

\frac{- 3 \times 8}{88} - \frac{1 \times 22}{88} + \frac{5 \times 11}{88}

\frac{- 24 - 22 + 55}{88}

\frac{- 46 + 55}{88} = \frac{9}{88}

(b)

\frac{- 5}{9} + \frac{- 7}{12} + \frac{11}{18}

\frac{- 5 \times 4}{36} - \frac{7 \times 3}{36} + \frac{11 \times 2}{36}

\frac{- 20 - 21 + 22}{36} = \frac{- 19}{36}

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