Primary 1 Mathematics Practice Paper 5

TuitionGoWhere Practice Paper - Mathematics Primary 1 — Answer Key (Version 5)

Subject: Mathematics Level: Primary 1 Paper: Practice Paper (Version 5) — Numbers Total Marks: 20

Marking Notes (General): This answer key matches the question numbering 1–20. For calculation items, step-by-step working is shown. For direct-recall items, the key idea is briefly explained so a new learner understands the method.

Section A: Counting and Place Value

Q1 (1 mark)

• Answer: 52
• Explanation: The picture shows 5 tens-rods (5 tens = 50) and 2 ones-cubes (2 ones = 2). Putting them together: 50 + 2 = 52. This is a place-value check: 5 is in the tens place and 2 is in the ones place.
• Common mistake: Writing "7" (counting total blocks) instead of combining 5 tens and 2 ones.
• Mark: 1 mark for the correct numeral 52.

Q2 (1 mark)

• Answer: 3 (ones)
• Explanation: In 83, the digit 3 is in the ones place, so its value is 3. (The digit 8 is in the tens place and is worth 80.)
• Mark: 1 mark for "3" or "3 ones".

Q3 (1 mark)

• Answer: 46
• Explanation: "Forty" = 40, "six" = 6. Combine: 40 + 6 = 46.
• Mark: 1 mark for 46.

Q4 (1 mark)

• Answer: 70
• Explanation: "1 more" means we add 1 to 69. Counting on: 69 → 70. This is the first number in the next ten-group.
• Mark: 1 mark for 70.

Section B: Comparing, Ordering and Patterns

Q5 (1 mark)

• Answer: <
• Explanation: 55 has 5 tens; 65 has 6 tens. The number with fewer tens is smaller. So 55 < 65.
• Mark: 1 mark for "<".

Q6 (1 mark)

• Answer: 47, 74, 89
• Explanation: Compare the tens digits first. 47 (4 tens) is the smallest, then 74 (7 tens), then 89 (8 tens) is the greatest.
• Mark: 1 mark for the correct order 47, 74, 89.

Q7 (1 mark)

• Answer: 20
• Explanation: The pattern adds 5 each step: 5 → 10 (+5) → 15 (+5) → 20 (+5) → 25.
• Mark: 1 mark for 20.

Q8 (1 mark)

• Answer: 50
• Explanation: From 92, we go down by 14 each step: 92 → 78 (−14) → 64 (−14) → 50 (−14) → 36. So the missing number is 50.
• Mark: 1 mark for 50.

Section C: Money

Q9 (1 mark)

• Answer: 80 ¢
• Explanation: Add the cent values: 50¢ + 20¢ + 10¢ = 80¢. (We do not convert to dollars because the question asks for cents.)
• Mark: 1 mark for 80.

Q10 (1 mark)

• Answer: $15
• Explanation: 3 × $5 =$5 + $5 +$5 = $15.
• Mark: 1 mark for $15.

Q11 (2 marks)

• Number sentence: $8 +$5 = $13
• Answer: $13
• Explanation: Mei Ling starts with $8. Her mother adds$5 more. We add: 8 + 5 = 13. So Mei Ling has $13 now.
• Mark breakdown:
  • 1 mark for the correct number sentence ($8 +$5 = $13 or equivalent).
  • 1 mark for the final answer $13.

Section D: Length

Q12 (1 mark)

• Answer: 8 cm
• Explanation: Place the crayon at the 0-cm mark. Read the mark at the other end: 8 cm. Always include the unit cm.
• Mark: 1 mark for 8 (or 8 cm).

Q13 (2 marks)

• Number sentence: 12 cm + 7 cm = 19 cm
• Answer: 19 cm
• Explanation: "Total length" means we add the two lengths: 12 + 7 = 19. Remember to keep the unit cm.
• Mark breakdown:
  • 1 mark for the correct number sentence.
  • 1 mark for the final answer 19 cm (must include unit).

Section E: Time

Q14 (1 mark)

• Answer: 4:10
• Explanation: The hour hand is just after 4 (so the hour is 4). The minute hand points to 2, and each number on the clock represents 5 minutes, so 2 × 5 = 10 minutes. The time is 4:10.
• Mark: 1 mark for 4:10 (or "ten past four").

Q15 (1 mark)

• Answer: 4:00 pm
• Explanation: A 1-hour lesson starting at 3:00 pm ends at 3:00 + 1:00 = 4:00 pm.
• Mark: 1 mark for 4:00 pm (or equivalent).

Q16 (1 mark)

• Answer: 10:00 pm
• Explanation: 9:30 pm + half an hour (30 minutes) = 10:00 pm. (Half an hour is the same as 30 minutes.)
• Mark: 1 mark for 10:00 pm.

Section F: Word Problems and Reasoning

Q17 (1 mark)

• Number sentence: 34 + 21 = 55
• Answer: 55 children
• Explanation: "Altogether" tells us to add the boys and girls. 34 + 21 = 55. No renaming across tens is needed: 30 + 20 = 50; 4 + 1 = 5; 50 + 5 = 55.
• Mark: 1 mark for the correct number sentence and answer.

Q18 (1 mark)

• Number sentence: 58 − 23 = 35
• Answer: 35 stickers
• Explanation: "Gives away" tells us to subtract. 58 − 23: subtract tens 50 − 20 = 30; subtract ones 8 − 3 = 5; combine 30 + 5 = 35.
• Mark: 1 mark for the correct number sentence and answer.

Section J: Bonus Stretch

Q19 (1 mark)

• Answer: 75
• Explanation: "Seventy" = 70. Add 5: 70 + 5 = 75. (This checks that the learner can convert number words to numerals and add.)
• Mark: 1 mark for 75.

Q20 (1 mark)

• Answer: 45
• Explanation: The pattern adds 11 each step: 12 + 11 = 23; 23 + 11 = 34; 34 + 11 = 45. (The tens digit grows by 1 each time and the ones digit grows by 1 each time.)
• Mark: 1 mark for 45.

Mark Summary

Mark allocation matches the stated Total Marks of 20.