Mixed questions

7 The temperature fell to −7 °C one winter’s night. By 9 am, the temperature was 4 °C.

By how much had the temperature risen?

8 Enlarge this shape by scale factor 3 about centre C.

9 a) Find the highest common factor of 24 and 42.

b) Find the lowest common multiple of 6 and 10.

10 Find the perimeter and the area of this trapezium.

Perimeter =

Area =

11

Calculate: a) 5 × (8 – 3) + 10 × 3 – 1 b) 5 × 8 – (3 + 10) × 3 – 1

12 Amy and her friends share a birthday cake. Amy eats 1 6 of the cake and her friends eat 2 3 of the remainder.

What fraction of the cake is left?