0580/32 Oct/Nov 2024, Question 1: Number Review: Mixed Practice

Part (a) · 3 marks

Find Sophie's change from $20 after buying 2.4 kg of onions at $1.85/kg and 4.5 kg of potatoes at $2.34/kg.

1. 1Onions: 2.4 × 1.85 = 4.44
2. 2Potatoes: 4.5 × 2.34 = 10.53
3. 3Total = 4.44 + 10.53 = 14.97
4. 4Change = 20 − 14.97 = $5.03

Answer5.03

Part (b) · 1 mark

Find the time 36 minutes after 10 47.

1. 110 47 + 13 min = 11 00, then + 23 min
2. 2= 11 23

Answer11 23

Part (c) · 2 marks

Show that 3 bottles of 2 litres each are enough for 7 days at two-thirds of a litre daily.

1. 17 × 2/3 = 14/3 litres
2. 214/3 ÷ 2 = 7/3 = 2 1/3 bottles
3. 32 bottles are not enough, so she needs at least 3 bottles

Answere.g. 7 × 2/3 = 14/3, 14/3 ÷ 2 = 7/3 bottles = 2 1/3 so 3 bottles needed

Part (d) · 2 marks

Given phones to computers ratio 3:5 and 40 computers sold, find the number of phones sold.

1. 140 ÷ 5 = 8 per part
2. 2Phones = 3 × 8 = 24

Answer24

Part (e) · 2 marks

Find phones sold in 2023 given 520 in 2022 and a 35% increase.

1. 1520 × (1 + 35/100) = 520 × 1.35
2. 2= 702

Answer702

Part (f) · 2 marks

Compare a $840 TV with one costing 3549 ringgits at $1 = 4.2 ringgits; state which is cheaper and by how many dollars.

1. 1Malaysia price in dollars = 3549 ÷ 4.2 = $845
2. 2845 − 840 = 5
3. 3USA is cheaper, by $5

AnswerUSA, 5

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