Primary 1 Mathematics Numbers Quiz

Primary 1 Mathematics Quiz - Numbers (Answer Key)

Total Marks: 30

Section A: Multiple Choice Questions (5 × 1 mark = 5 marks)

1. Answer: (3) 12

Explanation: Count each apple one by one. There are 3 rows of 4 apples: 4 + 4 + 4 = 12 apples altogether.
Marking: 1 mark for correct option.

2. Answer: (3) 60

Explanation: In the number 64, the digit 6 is in the tens place. Its value is 6 tens = 60. The digit 4 is in the ones place (value = 4).
Common mistake: Choosing (1) 6 confuses the digit with its value.
Marking: 1 mark for correct option.

3. Answer: (3) 35

Explanation: Compare the tens digit first. 35 has 3 tens; 45, 54, 53 have 4 or 5 tens. 3 tens is the smallest.
Marking: 1 mark for correct option.

4. Answer: (2) 24

Explanation: The pattern increases by 2 each time: 18 (+2) → 20 (+2) → 22 (+2) → 24 (+2) → 26 (+2) → 28.
Marking: 1 mark for correct option.

5. Answer: (2) 49

Explanation: The number just before 50 is one less than 50. Counting backwards: 50, 49, 48...
Marking: 1 mark for correct option.

Section B: Short Answer Questions (10 × 2 marks = 20 marks)

6. Numerals: 17

Words: seventeen Explanation: Count the stars carefully. There are 17 stars. In words, 17 is written as "seventeen" (not "seventeen" with a hyphen for 17; hyphens are used for 21–99 like twenty-one).
Marking: 1 mark for correct numeral, 1 mark for correct spelling in words.

7. (a) 53 = 5 tens 3 ones

(b) 8 tens 2 ones = 82 Explanation:
(a) 53 has 5 tens (50) and 3 ones (3).
(b) 8 tens = 80, 2 ones = 2, so 80 + 2 = 82.
Marking: 1 mark each part.

8. (a) 27 → value of 7 = 7 (7 ones)

(b) 73 → value of 7 = 70 (7 tens) Explanation:
(a) In 27, the digit 7 is in the ones place → value = 7.
(b) In 73, the digit 7 is in the tens place → value = 70.
Key concept: The same digit has different values depending on its place.
Marking: 1 mark each part.

9. (a) 46 < 64

(b) 81 > 18
(c) 55 = 55
(d) 90 > 9 Explanation: Compare tens first.
(a) 4 tens < 6 tens → 46 < 64
(b) 8 tens > 1 ten → 81 > 18
(c) Same number → equal
(d) 90 has 9 tens; 9 has 0 tens → 90 > 9
Marking: ½ mark each correct symbol (total 2 marks).

10. 38, 48, 83, 84

Explanation: Compare tens: 38 and 48 have 3 and 4 tens (smaller); 83 and 84 have 8 tens (larger). Among 38 and 48, 38 < 48. Among 83 and 84, 83 < 84.
Marking: 2 marks for fully correct order; 1 mark if only one error.

11. (a) 5, 10, 15, 20, 25, 30

(b) 60, 55, 50, 45, 40, 35 Explanation:
(a) Pattern increases by 5 (counting in fives). 15 + 5 = 20; 25 + 5 = 30.
(b) Pattern decreases by 5. 50 − 5 = 45; 40 − 5 = 35.
Marking: 1 mark each part (both blanks correct for the mark).

12. Missing numbers: 31, 33, 35, 37, 39

Explanation: The number line shows integers from 30 to 40. The labelled numbers are even (30, 32, 34, 36, 38, 40). The empty boxes are at the odd numbers between them.
Marking: 2 marks for all 5 correct; 1 mark for 3–4 correct.

13. (a) 92

(b) 76 Explanation:
(a) Compare tens: 92 has 9 tens; 29 and 22 have 2 tens. 92 is greatest.
(b) 76 has 7 tens; 67 has 6 tens; 57 has 5 tens. 76 is greatest.
Marking: 1 mark each part.

14. 55

Explanation: "10 more than 45" means 45 + 10 = 55. Add 1 ten to 4 tens → 5 tens = 50, plus 5 ones = 55.
Marking: 2 marks for correct answer; 1 mark for correct method (45 + 10) with calculation error.

15. 29

Explanation: "1 less than 30" means 30 − 1 = 29. Count back one from 30.
Marking: 2 marks for correct answer; 1 mark for correct method (30 − 1) with calculation error.

Section C: Word Problems (5 × 1 mark = 5 marks)

16. 39 children

Working: 24 + 15 = 39
Explanation: "Altogether" means add. 24 boys + 15 girls = 39 children.
Marking: 1 mark for correct answer.

17. 24 stickers

Working: 36 − 12 = 24
Explanation: "Gives away" means subtract. 36 − 12 = 24 stickers left.
Marking: 1 mark for correct answer.

18. 30 blue marbles

Working: 50 − 20 = 30
Explanation: Total = red + blue. Blue = Total − Red = 50 − 20 = 30.
Marking: 1 mark for correct answer.

19. 40 sweets

Working: 4 × 10 = 40 (or 10 + 10 + 10 + 10 = 40)
Explanation: 4 bags, 10 sweets each. This is multiplication as repeated addition: 4 groups of 10 = 40.
Marking: 1 mark for correct answer.

20. 8 pencils

Working: 40 ÷ 5 = 8 (or 5 + 5 + 5 + 5 + 5 + 5 + 5 + 5 = 40)
Explanation: 40 pencils shared equally into 5 boxes. This is division as equal sharing: 40 ÷ 5 = 8 pencils per box.
Marking: 1 mark for correct answer.

End of Answer Key