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Primary 3 Mathematics Measurement Quiz
Free P3 Maths Measurement quiz, Ox Exam version, with questions, answers, and syllabus-aligned practice for Singapore students.
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Primary 3 Mathematics Quiz - Measurement: Answer Key
Assessment set: SA2 Practice | Version: 1 of 5 | Total Marks: 65
Answer 1.
(2) 3250 m [3 km = 3000 m; 3000 + 250 = 3250 m] (2 marks)
New-student tip: To change kilometres to metres, multiply by 1000, because 1 km = 1000 m.
Answer 2.
(2) The pumpkin is heavier than the watermelon. [4 kg 500 g = 4500 g; 4500 g < 4800 g] (2 marks)
Marking note: Accept only option (2). A common error is choosing (1) by forgetting that 4 kg = 4000 g, so 4 kg 500 g is only 4500 g.
Answer 3.
(3) 2400 ml [2 ℓ = 2000 ml; 2000 + 400 = 2400 ml] (2 marks)
Answer 4.
(3) 7.45 p.m. [Times after 12 00 are p.m.; 19 45 − 12 00 = 7.45 p.m.] (2 marks)
Answer 5.
(2) 26 cm [Perimeter = 8 + 5 + 8 + 5 = 26 cm, or 2 × (8 + 5) = 26 cm] (2 marks)
Answer 6.
5060 m [5 km = 5000 m; 5000 + 60 = 5060 m] (3 marks)
Marking note: Award 2 marks for correct method (5 km = 5000 m) even if the final addition is wrong.
Answer 7.
Lightest: 4050 g, then 4 kg 500 g (= 4500 g), heaviest: 4 kg 550 g (= 4550 g) (3 marks)
Reasoning: Change all masses to grams first — 4500 g, 4050 g, 4550 g — then compare.
Answer 8.
1 h 25 min [2.15 p.m. to 3.15 p.m. = 1 h; 3.15 p.m. to 3.40 p.m. = 25 min; 1 h + 25 min = 1 h 25 min] (3 marks)
Answer 9.
49 cm² [Area of square = side × side = 7 × 7 = 49 cm²] (3 marks)
New-student tip: Area answers need square units (cm²), not plain cm.
Answer 10.
40 cm [Add all six sides: 12 + 8 + 5 + 3 + 7 + 5 = 40 cm] (3 marks)
Marking note: Award 2 marks for adding all six labelled sides correctly even if the total is wrong.
Answer 11.
185 cm, i.e. 1 m 85 cm [2 m 80 cm = 280 cm; 280 − 95 = 185 cm] (4 marks)
Method: Change both lengths to centimetres before subtracting, since 95 cm cannot be taken directly from 80 cm.
Answer 12.
750 ml [Juice poured out: 3 × 250 = 750 ml; Juice left: 1500 − 750 = 750 ml] (4 marks)
Method: 1 ℓ 500 ml = 1500 ml. Subtract the amount poured out from the starting amount.
Answer 13.
2 h 35 min [08 50 to 10 50 = 2 h; 10 50 to 11 25 = 35 min; total = 2 h 35 min] (4 marks)
Alternative method: Count on from 08 50 to 09 00 (10 min), then 09 00 to 11 00 (2 h), then 11 00 to 11 25 (25 min): 10 + 120 + 25 = 155 min = 2 h 35 min.
Answer 14.
30 m [Perimeter = 9 + 6 + 9 + 6 = 30 m, or 2 × (9 + 6) = 30 m] (4 marks)
Reasoning: Fencing goes all around the garden, so find the perimeter, not the area.
Answer 15.
12 000 g [Total mass: 6 × 2 kg = 12 kg; 12 kg = 12 × 1000 = 12 000 g] (4 marks)
Marking note: Both steps (multiplication and unit conversion) must be shown for full marks.
Answer 16.
4 m 50 cm [8 m = 800 cm; 800 − 350 = 450 cm; 450 cm = 4 m 50 cm] (4 marks)
Method: Work in centimetres first, then change back to metres and centimetres for the final answer.
Answer 17.
1 ℓ 550 ml [2 ℓ 800 ml = 2800 ml; 1 ℓ 250 ml = 1250 ml; Water used: 2800 − 1250 = 1550 ml = 1 ℓ 550 ml] (4 marks)
Reasoning: Water used = amount at first − amount left.
Answer 18.
6.15 p.m. [4.30 p.m. + 1 h = 5.30 p.m.; 5.30 p.m. + 45 min = 6.15 p.m.] (4 marks)
Method: Add the hours first, then add the minutes.
Answer 19.
(a) Breadth = 7 cm [Half of the perimeter = 36 ÷ 2 = 18 cm; Breadth = 18 − 11 = 7 cm] (b) Area = 77 cm² [Area = length × breadth = 11 × 7 = 77 cm²] (4 marks)
New-student tip: Length + breadth makes up half the perimeter of a rectangle, so divide by 2 first.
Answer 20.
(a) Total mass of apples = 2 kg 800 g [3 kg 400 g = 3400 g; 3400 − 600 = 2800 g] (b) Mass of one apple = 400 g [2800 ÷ 7 = 400 g] (4 marks)
Marking note: In (a), award 2 marks for converting to grams and 2 marks for the subtraction. In (b), accept 400 g only; the division must use the apples' mass, not the box's mass.
— End of Answer Key —