Multiplication and division: groups, doubling and sharing – Year 1 maths worksheet answers to download as PDF

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1. Answer to Question 1

   1. 3 groups of 2: 2, 4, 6. There are 6.
   2. 4 groups of 5: 5, 10, 15, 20. There are 20.
   3. 2 groups of 10: 10, 20. There are 20.

2. Answer to Question 2

   1. There are 3 groups with 3 in each group. Add one 3 for each group: 3 + 3 + 3 = 9.
   2. There are 2 groups with 4 in each group: 4 + 4 = 8. This is also double 4.
   3. There are 5 groups of 2. Count in 2s, one jump for each group: 2, 4, 6, 8, 10. So 2 + 2 + 2 + 2 + 2 = 10.

3. Answer to Question 3

   1. Double 3 = 3 + 3 = 6.
   2. Double 5 = 5 + 5 = 10.
   3. Double 7 = 7 + 7 = 14.
   4. Double 8 = 8 + 8 = 16.
   5. Double 10 = 10 + 10 = 20.

4. Answer to Question 4

   1. Half of 6 = 3, because 3 + 3 = 6.
   2. Half of 10 = 5, because 5 + 5 = 10.
   3. Half of 14 = 7, because 7 + 7 = 14.
   4. Half of 16 = 8, because 8 + 8 = 16.
   5. Half of 20 = 10, because 10 + 10 = 20.

5. Answer to Question 5

   1. The numbers go up in 2s. After 6 comes 8, and after 10 comes 12.
   2. The numbers go up in 5s. After 10 comes 15, and after 25 comes 30.
   3. The numbers go up in 10s, so only the tens digit changes. After 20 comes 30, and after 40 comes 50.
   4. Count on in 2s from 10: 10, 12, 14, 16. The missing number is 14.
   5. Counting back in 5s, each number is 5 less: 30, 25, 20, 15. The missing number is 20.

6. Answer to Question 6

   1. Count the lines of dots going across: there are 3 rows.
   2. Count the dots in one row: there are 4 dots, and every row is the same.
   3. Count in 4s, one jump for each row: 4, 8, 12. There are 12 dots in all.
   4. Now there are 4 rows of 3. Count in 3s: 3, 6, 9, 12. It is still 12 dots: turning the array does not change how many dots there are.

7. Answer to Question 7

   1. 6 ÷ 2 = 3 on each plate. Check: 3 + 3 = 6.
   2. 8 ÷ 4 = 2 on each plate. Check: 2 + 2 + 2 + 2 = 8.
   3. 10 ÷ 5 = 2 on each plate. Check: 2 × 5 = 10.
   4. 15 ÷ 3 = 5 on each plate. Check: 5 + 5 + 5 = 15.

8. Answer to Question 8

   1. Each box holds 6 eggs and there are 2 boxes: 6 + 6 = 12 eggs. This is double 6.
   2. Add one more 6 for the third box: 6, 12, 18. There are 18 eggs in all 3 boxes.
   3. The first two boxes hold 12 eggs. Half of 12 means 2 equal groups of 6, so she gives 6 eggs to the neighbour.
   4. She keeps the other half: 12 − 6 = 6 eggs.

9. Answer to Question 9

   1. 2, 4, 6, 8, 10. 10 hands.
   2. Count in 5s ten times: 5, 10, ... 50. There are 50 fingers.
   3. There are 10 feet (the same as hands).
   4. 10 feet with 5 toes each: 5, 10, ... 50. 50 toes.

10. Answer to Question 10

    1. Share 12 sweets between 2 children, one at a time, until none are left. Each child gets 6 sweets, because 6 + 6 = 12.
    2. Share 12 between 3 children: each child gets 4, because 4 + 4 + 4 = 12.
    3. Share 12 between 4 children: each child gets 3, because 3 + 3 + 3 + 3 = 12.
    4. Each child got 6, then 4, then 3. The more children share, the fewer sweets each child gets, because the same 12 sweets are split into more groups.

11. Answer to Question 11

    1. Half of 20 is 10 in each team.
    2. 5, 10, 15, 20 gives 4 teams.
    3. Teams of 10: 2 teams. Teams of 5: 4 teams. Teams of 5 give more teams.
    4. Double 3 is 6. The second team scores 6 goals.

12. Answer to Question 12

    1. There are 4 tanks of 5 fish. Count in 5s, one jump for each tank: 5, 10, 15, 20. There are 20 fish.
    2. There are 3 cages of 2 hamsters. Count in 2s: 2, 4, 6. There are 6 hamsters.
    3. Add the fish and the hamsters: 20 + 6 = 26 animals.
    4. Half of 6 means 2 equal groups of 3, so the shop sells 3 hamsters and 3 are left.

13. Answer to Question 13

    1. Max buys 4 packs of 2. Count in 2s: 2, 4, 6, 8. Max buys 8 sandwiches.
    2. His friends buy 6 packs of 2. Count in 2s six times: 2, 4, 6, 8, 10, 12. They buy 12 sandwiches.
    3. Add the two amounts: 8 + 12 = 20 sandwiches in all.
    4. Half of 20 means 2 equal groups of 10, because 10 + 10 = 20. So 10 sandwiches go to the school trip.

14. Answer to Question 14

    1. Each child has 2 shoes and there are 7 children. Count in 2s seven times: 2, 4, 6, 8, 10, 12, 14. There are 14 shoes.
    2. 3 more children bring 2 shoes each: 2, 4, 6. That is 6 more shoes (double 3).
    3. Add the new shoes: 14 + 6 = 20 shoes altogether.
    4. Half of 20 is 10, because 10 + 10 = 20. So 10 shoes are black.

15. Answer to Question 15

    1. 5, 10, 15, 20. She needs 20 slices.
    2. 20 is more than 15. Yes, he is right.
    3. 10, 20. She needs 2 packs.
    4. 2 packs hold 20 slices, and she needs 20. 0 are left over.

16. Answer to Question 16

    1. Half of 16 is 8, because 8 + 8 = 16.
    2. 16 − 8 = 8 stickers.
    3. 4 + 8 = 12 stickers.
    4. 8 + 12 = 20 stickers. Check: 16 + 4 = 20.

17. Answer to Question 17

    1. 4 groups of 2: 2, 4, 6, 8. The answer is 8. Wrong.
    2. 7 + 7 = 14. Right.
    3. 9 + 9 = 18, so half of 18 is 9. Wrong.
    4. 5, 10, 15. Right.

18. Answer to Question 18

    1. 2, 4, 6, 8, 10. 10 plants in one bed.
    2. 10, 20, 30, 40. 40 plants.
    3. 40 is more than 30. Yes, she is right.
    4. Half of 40 is 20 flowers.

19. Answer to Question 19

    1. Double 4 is 8.
    2. Double 8 is 16.
    3. Saturday has 32 seeds, which is more than 20. Saturday.
    4. 1 + 2 + 4 + 8 = 15 seeds.

20. Answer to Question 20

    1. 12 ÷ 2 = 6 groups.
    2. 12 ÷ 3 = 4 groups.
    3. 12 ÷ 4 = 3 groups.
    4. 5, 10, 15 jumps over 12. Two groups of 5 use 10, so 2 are left over. No.