Primary 2 Mathematics Multiplication Division Quiz

Primary 2 Mathematics Quiz - Multiplication Division: Answer Key

Total Marks: 20

Section A: Multiplication Facts (Questions 1 – 5)

1. 3 × 5 = 15

• Marks: 1
• Explanation: Multiplication is repeated addition. 3 × 5 means 3 groups of 5, or 5 + 5 + 5 = 15. Knowing the 5-times table helps: 1×5=5, 2×5=10, 3×5=15.
• Common mistake: Students might confuse 3×5 with 3+5=8. Remind them that × means "groups of".

2. 7 × 2 = 14

• Marks: 1
• Explanation: 7 × 2 means 7 groups of 2, or 2 + 2 + 2 + 2 + 2 + 2 + 2 = 14. The 2-times table is all about doubling: 7 × 2 = 14.
• Common mistake: Counting incorrectly when adding seven 2s.

3. 9 × 10 = 90

• Marks: 1
• Explanation: The 10-times table is easy: any number × 10 is that number with a 0 at the end. 9 × 10 = 90.
• Common mistake: Forgetting the zero, writing 9 instead of 90.

4. 4 × 6 = 24

• Marks: 1
• Explanation: 4 × 6 means 4 groups of 6, or 6 + 6 + 6 + 6 = 24. Knowing the 4-times table: 4, 8, 12, 16, 20, 24.
• Common mistake: Thinking 4×6 = 4+6=10. Emphasise that × means "groups of".

5. 8 × 5 = 40

• Marks: 1
• Explanation: 8 × 5 means 8 groups of 5, or 5 + 5 + 5 + 5 + 5 + 5 + 5 + 5 = 40. The 5-times table ends in 0 or 5: 5, 10, 15, 20, 25, 30, 35, 40.
• Common mistake: Counting by 5s incorrectly (e.g., missing a 5).

Section B: Division Facts (Questions 6 – 10)

6. 20 ÷ 5 = 4

• Marks: 1
• Explanation: Division is sharing equally. 20 ÷ 5 means "20 shared into 5 equal groups". Each group gets 4. We can check: 4 × 5 = 20.
• Common mistake: Writing 20 ÷ 5 = 5 (confusing with 5×5=25). Use the multiplication check.

7. 18 ÷ 3 = 6

• Marks: 1
• Explanation: 18 ÷ 3 means "18 shared into 3 equal groups". Each group gets 6. Check: 6 × 3 = 18.
• Common mistake: Writing 18 ÷ 3 = 9 (confusing with 9×2=18). Remind students to think "what times 3 equals 18?"

8. 40 ÷ 10 = 4

• Marks: 1
• Explanation: 40 ÷ 10 means "40 shared into 10 equal groups". Each group gets 4. Check: 4 × 10 = 40.
• Common mistake: Writing 40 ÷ 10 = 40 (thinking 10 goes into 40 zero times). Use the 10-times table: 4×10=40, so 40÷10=4.

9. 12 ÷ 4 = 3

• Marks: 1
• Explanation: 12 ÷ 4 means "12 shared into 4 equal groups". Each group gets 3. Check: 3 × 4 = 12.
• Common mistake: Writing 12 ÷ 4 = 8 (confusing with 12-4=8). Remind students that division is the opposite of multiplication.

10. 14 ÷ 2 = 7

• Marks: 1
• Explanation: 14 ÷ 2 means "14 shared into 2 equal groups". Each group gets 7. Check: 7 × 2 = 14.
• Common mistake: Writing 14 ÷ 2 = 12 (confusing with 14-2=12). Emphasise the relationship: 2 × 7 = 14.

Section C: Missing Numbers and Relationships (Questions 11 – 15)

11. 6 × ____ = 24

• Answer: 4
• Marks: 1
• Explanation: We need to find what number multiplied by 6 gives 24. Think of the 6-times table: 6, 12, 18, 24. 6 × 4 = 24. Alternatively, use division: 24 ÷ 6 = 4.
• Common mistake: Writing 6 (6×6=36) or 3 (6×3=18). Use the 6-times table to check.

12. ____ × 5 = 35

• Answer: 7
• Marks: 1
• Explanation: We need to find what number multiplied by 5 gives 35. Think of the 5-times table: 5, 10, 15, 20, 25, 30, 35. 7 × 5 = 35. Alternatively, use division: 35 ÷ 5 = 7.
• Common mistake: Writing 5 (5×5=25) or 6 (6×5=30). Count by 5s carefully.

13. 30 ÷ ____ = 6

• Answer: 5
• Marks: 1
• Explanation: We need to find what number divides 30 to give 6. Think: 30 shared into how many groups gives each group 6? 30 ÷ 5 = 6. Check: 6 × 5 = 30.
• Common mistake: Writing 4 (6×4=24, not 30) or 6 (6×6=36). Use multiplication to check.

14. ____ ÷ 4 = 8

• Answer: 32
• Marks: 1
• Explanation: We need to find what number divided by 4 gives 8. Think: what number shared into 4 groups gives each group 8? 32 ÷ 4 = 8. Check: 8 × 4 = 32.
• Common mistake: Writing 12 (12÷4=3) or 24 (24÷4=6). Use multiplication: 8 × 4 = 32.

15. If 7 × 3 = 21, then 21 ÷ 3 = ____

• Answer: 7
• Marks: 1
• Explanation: This shows the inverse relationship between multiplication and division. If 7 × 3 = 21, then 21 ÷ 3 = 7 and 21 ÷ 7 = 3. The division "undoes" the multiplication.
• Common mistake: Writing 3 (confusing which number to divide by). Remind students that division is the opposite of multiplication.

Section D: Word Problems (Questions 16 – 20)

16. A baker bakes 4 trays of cupcakes. Each tray has 6 cupcakes. How many cupcakes does the baker bake altogether?

• Answer: 24 cupcakes
• Marks: 1
• Explanation: This is a multiplication problem. 4 trays × 6 cupcakes per tray = 24 cupcakes. We can think of it as 4 groups of 6: 6 + 6 + 6 + 6 = 24.
• Working: 4 × 6 = 24
• Common mistake: Adding 4 + 6 = 10 instead of multiplying. Look for keywords: "each tray has" and "altogether" often signal multiplication.

17. Mrs. Lim has 30 stickers. She gives them equally to 5 children. How many stickers does each child get?

• Answer: 6 stickers
• Marks: 1
• Explanation: This is a division problem. 30 stickers ÷ 5 children = 6 stickers per child. We are sharing equally.
• Working: 30 ÷ 5 = 6
• Common mistake: Subtracting 30 - 5 = 25. Look for keywords: "gives them equally" signals sharing/division.

18. There are 8 rows of chairs in a hall. Each row has 4 chairs. How many chairs are there in the hall?

• Answer: 32 chairs
• Marks: 1
• Explanation: This is a multiplication problem. 8 rows × 4 chairs per row = 32 chairs. We can think of it as 8 groups of 4.
• Working: 8 × 4 = 32
• Common mistake: Adding 8 + 4 = 12. Remind students that "rows of" means groups, so we multiply.

19. A farmer packs 24 apples into bags. Each bag has 3 apples. How many bags does the farmer use?

• Answer: 8 bags
• Marks: 1
• Explanation: This is a division problem. 24 apples ÷ 3 apples per bag = 8 bags. We are finding how many groups of 3 are in 24.
• Working: 24 ÷ 3 = 8
• Common mistake: Multiplying 24 × 3 = 72. Look for keywords: "packs into bags" and "each bag has" often signal division.

20. Tom has 15 marbles. He puts them into groups of 5. How many groups does Tom make?

• Answer: 3 groups
• Marks: 1
• Explanation: This is a division problem. 15 marbles ÷ 5 marbles per group = 3 groups. We are finding how many groups of 5 are in 15.
• Working: 15 ÷ 5 = 3
• Common mistake: Subtracting 15 - 5 = 10. Look for keywords: "groups of" signals division.

End of Answer Key