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Primary 1 Mathematics Numbers Quiz
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Primary 1 Mathematics Quiz - Numbers: Answer Key
Practice Version: 1 of 5 | Total Marks: 40
Marking notes: Award marks as stated. Accept correct answers reached by any sensible method.
Answer 1. (1 mark)
Answer: 24 balloons. Teaching note: Count in groups so you do not lose track. Each row holds 10 balloons: count 10, then 20. Then count the loose balloons: 21, 22, 23, 24. Counting in tens is faster and shows how big numbers are built from groups of ten. **Common mistake
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# Primary 1 Mathematics Quiz - Numbers: Answer Key
**Practice Version:** 1 of 5 | **Total Marks:** 40
*Marking notes: Award marks as stated. Accept correct answers reached by any sensible method.*
## Answer 1. (1 mark)
**Answer:** 24 balloons.
**Teaching note:** Count the two rows of 10 first (10, then 20), then count the loose balloons: 21, 22, 23, 24. Counting in groups of ten keeps track easily.
## Answer 2. (1 mark)
**Answer:** 46
## Answer 3. (1 mark)
**Answer:** Seventy
## Answer 4. (1 mark)
**Answer:** 85
**Teaching note:** Compare the tens digits: 8 tens is more than 5 tens, so 85 is greater.
## Answer 5. (1 mark)
**Answer:** 79
## Answer 6. (2 marks)
**Answer:** 90 (the 9 stands for 9 tens).
**Common mistake:** Writing just "9". The value of the digit 9 in 93 is ninety.
## Answer 7. (2 marks)
**Answer:** 65 = **6** tens **5** ones
## Answer 8. (2 marks)
**Answer:** 29, 34, 38, 43
**Teaching note:** Compare the tens digits first: 2 tens < 3 tens < 4 tens.
## Answer 9. (2 marks)
**Answer:** 20 and 25
**Teaching note:** The pattern counts on by 5s: 5, 10, 15, 20, 25.
## Answer 10. (2 marks)
**(a)** Siti [1]
**(b)** Fifth [1]
## Answer 11. (3 marks)
**Answer:** 72, 57, 27
**Teaching note:** Order by tens first: 7 tens > 5 tens > 2 tens.
## Answer 12. (3 marks)
**(a)** 50 and 60 [2]
**(b)** The pattern adds 5 each time (counts on by 5s). [1]
## Answer 13. (3 marks)
**(a)** Mei Ling [1]
**(b)** 42 has 4 tens and 39 has 3 tens. 4 tens is more than 3 tens, so 42 is greater than 39. [2]
**Common mistake:** Comparing only the ones digits (2 and 9); always compare tens first.
## Answer 14. (3 marks)
**(a)** Wei Ming came in 4th ("just after" Priya's 3rd place). [1]
**(b)** Jun Jie came in 6th (last of six children). [1]
**(c)** 3 children came before Wei Ming (1st, 2nd and 3rd places). [1]
## Answer 15. (3 marks)
**Working:** Ones digit = 7. Tens digit is 2 more than 7, so tens digit = 9. Put them together: 97.
**Answer:** 97
**Marking:** 1 mark for finding the tens digit (9), 1 mark for using both clues correctly, 1 mark for the final answer 97.
## Answer 16. (2 marks)
**Answer:** 24 and 22
**Teaching note:** The pattern counts back by 2s: 30, 28, 26, 24, 22.
## Answer 17. (2 marks)
**(a)** Greatest number: 85 (put the bigger digit, 8, in the tens place). [1]
**(b)** Smallest number: 58 (put the smaller digit, 5, in the tens place). [1]
## Answer 18. (2 marks)
**(a)** 67 (two ticks after 65) [1]
**(b)** 68 [1]
## Answer 19. (2 marks)
**(a)** 4 full bundles (10, 20, 30, 40). [1]
**(b)** 5 pencils left over (45 − 40 = 5). [1]
**Teaching note:** This shows 45 = 4 tens and 5 ones.
## Answer 20. (2 marks)
**Working:** There are 10 children. Aisha is 6th from the front, so 4 children stand behind her (children 7, 8, 9, 10). Counting Aisha plus those behind her: 1 + 4 = 5.
**Answer:** Aisha is 5th from the back.
**Marking:** 1 mark for correct working or counting-back method, 1 mark for the answer 5th.
**Quick check:** Position from front + position from back = total + 1, so 6 + 5 = 11 = 10 + 1. ✓
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**End of answer key.**