iGCSE Mathematics (0580) : C1.6 Order quantities by magnitude and demonstrate familiarity with the symbols \(=,\neq ,>,

Question

(a) The temperature on Monday was -7°C.
The temperature on Tuesday was 5°C lower than on Monday.
The temperature on Wednesday was 8°C higher than on Tuesday.
Find the temperature on Wednesday.

(b) Kyra has a faulty thermometer.
It always shows the temperature as 2°C higher than the actual temperature.
The temperature on the thermometer is T°C.
Write an expression, in terms of T, for the actual temperature.

▶️ Answer/Explanation

Answer:

(a) −4°C

Tuesday’s temperature: Monday’s temperature (−7°C) minus 5°C = −7 − 5 = −12°C.
Wednesday’s temperature: Tuesday’s temperature (−12°C) plus 8°C = −12 + 8 = −4°C.

(b) T − 2

Since the thermometer reads 2°C higher than actual, subtract 2 from the displayed temperature (T) to get the actual temperature.

Question

Put one pair of brackets in each calculation to make it correct.

(a) 15 + 12 – 3 × 4 = 51

(b) 15 + 12 – 3 × 4 = 96

▶️ Answer/Explanation

Solution

Ans (a): 15 + (12 – 3) × 4 = 51

First operation in brackets: 12 – 3 = 9

Then multiply: 9 × 4 = 36

Finally add: 15 + 36 = 51

Ans (b): (15 + 12 – 3) × 4 = 96

First operations in brackets: 15 + 12 – 3 = 24

Then multiply: 24 × 4 = 96

iGCSE Mathematics (0580) : C1.6 Order quantities by magnitude and demonstrate familiarity with the symbols \(=,\neq ,>,<,\geqslant ,\leqslant \). iGCSE Style Questions Paper 1

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