Term 2 review
Answers are for parents and teachers.
1
Calculate 7/8 ÷ 1/4 and 3.5 ÷ 0.5.
7/8 × 4 = 28/8 = 3 1/2. And 35 ÷ 5 = 7.
2
A train goes 270 km in 3 hours. Find its speed in km/h and in m/s.
270 ÷ 3 = 90 km/h. 90 × 1,000 ÷ 3,600 = 25 m/s.
3
A bag costs 400 LE with 15% off. What is the sale price?
15% of 400 = 60. Sale price 340 LE.
4
A rectangle has vertices (−2, 1), (4, 1) and (4, −3). Find the fourth vertex, the perimeter and the area.
Fourth vertex (−2, −3). Sides 6 and 4. Perimeter 20 units, area 24 square units.
5
A cuboid 4 cm by 3 cm by 2 cm has all its dimensions doubled. Find the old and new volume and surface area.
Old: volume 24 cm³, surface area 2 × (12 + 8 + 6) = 52 cm². New (8, 6, 4): volume 192 cm³ (8 times), surface area 208 cm² (4 times).