Length, perimeter, mass and capacity – Year 3 maths test answers to download as PDF

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1. Answer to Question 1 (4 marks)

   1. 4 m is 4 × 100 = 400 cm. Add the extra 30 cm: 400 + 30 = 430 cm. (1 mark)
   2. 1 kg is 1000 g. 3000 g is three lots of 1000 g, so it is 3 kg. (1 mark)
   3. 2 l is 2000 ml. Add the 250 ml: 2000 + 250 = 2250 ml. (1 mark)
   4. Each metre is 100 cm. 600 cm contains six hundreds, so it is 6 m. (1 mark)

2. Answer to Question 2 (4 marks)

   1. Add all four sides of the rectangle, two long and two short: 14 + 6 + 14 + 6. 14 + 14 = 28 and 6 + 6 = 12, so 28 + 12 = 40 cm. (2 marks: 1 for adding four sides, 1 for 40 cm)
   2. A square has 4 equal sides, so share the perimeter by 4: 40 ÷ 4 = 10 cm. Check: 10 + 10 + 10 + 10 = 40. (2 marks: 1 for dividing by 4, 1 for 10 cm)

3. Answer to Question 3 (4 marks)

   1. 1 kg is 1000 g. Ben uses 350 g: 1000 − 350 = 650 g left. (1 mark)
   2. Change to millilitres: 2 l = 2000 ml and 1 l 200 ml = 1200 ml. 2000 − 1200 = 800 ml left. (1 mark)
   3. A spoon of medicine is a tiny amount of liquid, much less than a litre, so we use ml. (1 mark)
   4. A pencil is very light, much less than a bag of sugar, so we measure it in g. (1 mark)

4. Answer to Question 4 (4 marks)

   1. 1 m is 100 cm. A = 100 + 20 = 120 cm, B = 95 cm, C = 100 + 5 = 105 cm. (2 marks: all three correct; 1 mark for two)
   2. Compare 95, 105 and 120: the order from shortest is B, C, A. (1 mark)
   3. Find the difference: count on from 95 to 120, which is 5 to reach 100 and 20 more. A is 25 cm longer than B. (1 mark)

5. Answer to Question 5 (4 marks)

   1. Add the four sides of the rectangle: 30 + 20 + 30 + 20. 30 + 30 = 60 and 20 + 20 = 40, so the perimeter is 100 m. (2 marks: 1 for adding four sides, 1 for 100 m)
   2. Each metre costs £2: 100 × £2 = £200. (1 mark)
   3. He needs 100 m and has 80 m: 100 − 80 = 20 m more. (1 mark)

Total : 20 marks