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When writing an amount as a fraction of the total make sure both are in the same units first. Examples Write each amount as a fraction of the total amount in simplest form. (a) 12 cm out of 28 cm same units 12 28 = = (b) 20 seconds out of 2 minutes 12÷4 28÷4 3 7 different units 2 minutes = 2 x 60 = 120 seconds 20 120 = = 20÷20 120÷20 1 6 Exercise 1C p17 Q14aceg, 17, 19, 20, 22