WAEC Mathematics 1991 (August) Theory question 101

Theory question 101

Fractions, Decimals and Approximation

Simplify: (i) 2 2/3 − (2½ − 1 4/5) (ii) (3.25 − 1.64)/(2.47 − 2.01)

Show the model answer
Model answer

(i) 2½ − 1⅘ = 5/2 − 9/5 = 7/10
2⅔ − 7/10 = 80/30 − 21/30 = 59/30 = 1 29/30
(ii) 1.61 ÷ 0.46 = 161/46 = 3.5

Explanation

Work out the bracket first.