Primary 1 Mathematics Practice Paper 3

TuitionGoWhere Practice Paper - Mathematics Primary 1 (Answer Key)

Subject: Mathematics
Level: Primary 1
Paper: Practice Paper 3 (Numbers up to 100)
Total Marks: 40

Section A: Multiple Choice Questions (10 marks)

1. Answer: (3) 18

Explanation: Count each star carefully. There are 3 rows of 6 stars each. 6 + 6 + 6 = 18 stars in total.
Mark: 1

2. Answer: (3) 50

Explanation: In the number 58, the digit 5 is in the tens place. Its value is 5 tens = 50. The digit 8 is in the ones place with a value of 8.
Common mistake: Choosing (1) 5 confuses the digit with its value.
Mark: 1

3. Answer: (2) 24

Explanation: Compare the tens digit first. 24 has 2 tens; 42, 34, 43 have 3 or 4 tens. The smallest number of tens is 2, so 24 is the smallest.
Mark: 1

4. Answer: (2) 18

Explanation: The pattern increases by 2 each time: 12 (+2) → 14 (+2) → 16 (+2) → 18 (+2) → 20 (+2) → 22.
Mark: 1

5. Answer: (2) 49

Explanation: The number just before 50 is one less than 50. 50 − 1 = 49.
Mark: 1

6. Answer: (1) 37

Explanation: The base-10 blocks show 3 tens rods (3 × 10 = 30) and 7 ones cubes (7 × 1 = 7). 30 + 7 = 37.
Mark: 1

7. Answer: (1) 56, 57, 65, 75

Explanation: Compare tens first: 56 and 57 have 5 tens; 65 has 6 tens; 75 has 7 tens. Among the 50s, 56 < 57. Order: 56, 57, 65, 75.
Mark: 1

8. Answer: (2) 40

Explanation: 45 = 40 + 5. The number 45 has 4 tens (40) and 5 ones (5).
Mark: 1

9. Answer: (1) Eighty-two

Explanation: 82 = 80 + 2. In words: "eighty" for 80 and "two" for 2, joined with a hyphen → "eighty-two".
Mark: 1

10. Answer: (1) 11

Explanation: Total children = 24. Boys = 13. Girls = Total − Boys = 24 − 13 = 11.
Mark: 1

Section B: Short Answer Questions (20 marks)

11. Numerals: 29

Words: Twenty-nine
Explanation: Count the apples. There are 2 groups of 10 (20) and 9 loose apples. 20 + 9 = 29. In words: "twenty" + "nine" = "twenty-nine" (hyphenated).
Marks: 1 for numerals, 1 for words

12. (a) 63 = 6 tens 3 ones

(b) 80 = 8 tens 0 ones
Explanation:

• 63: The digit 6 is in the tens place → 6 tens = 60. The digit 3 is in the ones place → 3 ones = 3.
• 80: The digit 8 is in the tens place → 8 tens = 80. The digit 0 is in the ones place → 0 ones.
  Marks: 1 each part (½ for tens, ½ for ones)

13. (a) 47 < 74

(b) 59 = 59
(c) 81 > 18
(d) 36 < 63
Explanation: Compare tens digits first. If tens are equal, compare ones digits.

• 47 has 4 tens, 74 has 7 tens → 47 < 74
• Both are 59 → equal
• 81 has 8 tens, 18 has 1 ten → 81 > 18
• 36 has 3 tens, 63 has 6 tens → 36 < 63
  Marks: ½ each, total 2

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

(b) 50, 45, 40, 35, 30, 25
Explanation:

• (a) Pattern increases by 5 each time (counting in fives). 15 + 5 = 20, 20 + 5 = 25.
• (b) Pattern decreases by 5 each time. 40 − 5 = 35, 35 − 5 = 30.
  Marks: 1 each part (½ per blank)

15. Number line labels from left to right:

60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70
Explanation: The number line goes from 60 to 70 in steps of 1. Fill in the missing integers between the given labels.
Marks: 2 (all 6 missing numbers correct = 2 marks; 4–5 correct = 1 mark; ≤3 correct = 0 marks)

16. Circle 75 (greatest), underline 27 (smallest)

Explanation: Compare all numbers: 72, 27, 57, 75, 52.

• Tens digits: 7, 2, 5, 7, 5. Smallest tens = 2 → 27 is smallest.
• Among the 70s (72, 75), compare ones: 2 < 5 → 75 is greatest.
  Marks: 1 for circling 75, 1 for underlining 27

17. (a) 1 more than 49 is 50

(b) 1 less than 60 is 59
(c) 10 more than 35 is 45
(d) 10 less than 80 is 70
Explanation:

• (a) 49 + 1 = 50 (crosses a tens boundary)
• (b) 60 − 1 = 59
• (c) 35 + 10 = 45 (add 1 ten)
• (d) 80 − 10 = 70 (subtract 1 ten)
  Marks: ½ each, total 2

18. 88, 84, 80, 48, 44

Explanation: Order from greatest to smallest. Compare tens: 88 and 84 have 8 tens; 80 has 8 tens; 48 and 44 have 4 tens. Among 80s: 88 > 84 > 80. Among 40s: 48 > 44.
Marks: 2 (all 5 correct = 2; 3–4 correct = 1; ≤2 correct = 0)

19. Working: 36 + 24 = 60

Answer: 60 marbles
Explanation: "Altogether" means addition. Add the tens: 30 + 20 = 50. Add the ones: 6 + 4 = 10. 50 + 10 = 60. Or use column addition.
Marks: 1 for working, 1 for answer

20. Working: 50 − 18 = 32

Answer: 32 stickers
Explanation: "Gives away" means subtraction. 50 − 18: subtract ones (0 − 8, need to regroup: 50 = 40 + 10; 10 − 8 = 2), subtract tens (40 − 10 = 30). 30 + 2 = 32.
Marks: 1 for working, 1 for answer

Section C: Word Problems (10 marks)

21. Working: 45 − 23 = 22

Answer: 22 cookies
Explanation: "Sold" means taken away → subtraction. 45 − 23: ones: 5 − 3 = 2; tens: 40 − 20 = 20; total = 22.
Marks: 1 for working, 1 for answer

22. Working: 28 + 32 = 60

Answer: 60 children
Explanation: "Altogether" means addition. 28 + 32: ones: 8 + 2 = 10; tens: 20 + 30 = 50; 50 + 10 = 60.
Marks: 1 for working, 1 for answer

23. Working: 65 − 27 = 38

Answer: 38 pages
Explanation: "How many more pages to finish" means subtract pages read from total pages. 65 − 27: regroup 65 as 50 + 15; ones: 15 − 7 = 8; tens: 50 − 20 = 30; total = 38.
Marks: 1 for working, 1 for answer

24. Working: 4 × 10 = 40 (or 10 + 10 + 10 + 10 = 40)

Answer: 40 pencils
Explanation: 4 boxes, each with 10 pencils. This is 4 groups of 10 → multiplication: 4 × 10 = 40. Can also use repeated addition.
Marks: 1 for working, 1 for answer

25. Working: 20 ÷ 4 = 5 (or 20 shared into 4 equal groups → 5 each)

Answer: 5 sweets
Explanation: "Share equally among 4 children" means division. 20 sweets ÷ 4 children = 5 sweets each. Check: 5 + 5 + 5 + 5 = 20.
Marks: 1 for working, 1 for answer

Total Marks: 40