Addition and subtraction to 100 – Year 2 maths worksheet answers to download as PDF

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1. Answer to Question 1

   1. Add 1 tens: 23 + 10 = 33. Add 4 ones: 33 + 4 = 37.
   2. Add 3 tens: 45 + 30 = 75. Add 2 ones: 75 + 2 = 77.
   3. Add 2 tens: 58 + 20 = 78. Add 1 ones: 78 + 1 = 79.
   4. Add 4 tens: 36 + 40 = 76. Add 0 ones: 76 + 0 = 76.
   5. Add 2 tens: 64 + 20 = 84. Add 5 ones: 84 + 5 = 89.

2. Answer to Question 2

   1. 28 + 2 = 30, then 30 + 3 = 33.
   2. 47 + 3 = 50, then 50 + 3 = 53.
   3. 69 + 1 = 70, then 70 + 3 = 73.
   4. 35 + 5 = 40, then 40 + 3 = 43.
   5. 76 + 4 = 80, then 80 + 5 = 85.

3. Answer to Question 3

   1. Ones: 4 + 5 = 9. Tens: 3 + 2 = 5. 59. No carrying.
   2. Ones: 7 + 8 = 15, write 5 carry 1. Tens: 4 + 3 + 1 = 8. 85.
   3. Ones: 6 + 7 = 13, write 3 carry 1. Tens: 5 + 2 + 1 = 8. 83.
   4. Ones: 9 + 4 = 13, write 3 carry 1. Tens: 1 + 6 + 1 = 8. 83.
   5. Ones: 8 + 9 = 17, write 7 carry 1. Tens: 3 + 4 + 1 = 8. 87.

4. Answer to Question 4

   1. 68 − 23: take away 20, then take away 3. 45.
   2. 75 − 41: take away 40, then take away 1. 34.
   3. 92 − 30: take away 30, then take away 0. 62.
   4. 57 − 6: take away 0, then take away 6. 51.
   5. 83 − 28: take away 20, then take away 8. 55.

5. Answer to Question 5

   1. 43 to 50 is 7, and 50 to 58 is 8. 7 + 8 = 15.
   2. 37 to 40 is 3, and 40 to 52 is 12. 3 + 12 = 15.
   3. 61 to 70 is 9.
   4. 45 to 49 is 4.

6. Answer to Question 6

   1. 59 − 33 = 26 and 59 − 26 = 33.
   2. 62 − 17 = 45 and 62 − 45 = 17.
   3. 82 − 44 = 38 and 82 − 38 = 44.

7. Answer to Question 7

   1. 34 + 25 = 59. Add 20 to get 54, then 5 more: 59 biscuits.
   2. 59 + 18 = 77. Add 20 to get 79, then take away 2: 77 biscuits.
   3. 77 − 29 = 48. Take away 30 to get 47, then add 1: 48 biscuits.
   4. 48 − 6 = 42 biscuits.

8. Answer to Question 8

   1. 46 + 38 = 84. Ones: 6 + 8 = 14, carry 1. Tens: 4 + 3 + 1 = 8. 84 rolls.
   2. 84 − 52 = 32 rolls.
   3. 32 + 15 = 47 rolls.
   4. 60 − 47 = 13. No, there are 13 rolls too few.

9. Answer to Question 9

   1. 27 + 45 = 72. Ones: 7 + 5 = 12, carry 1. Tens: 2 + 4 + 1 = 7. 72 stickers.
   2. 72 + 19 = 91. Add 20 to get 92, take away 1. 91 stickers.
   3. 100 − 91 = 9 stickers.
   4. 45 + 12 = 57 stickers.

10. Answer to Question 10

    1. 29 + 26 = 55. Add 30 to get 59, take away 4. 55 children.
    2. 55 + 4 + 7 = 66. 55 + 4 = 59 and 59 + 7 = 66. 66 people.
    3. 80 − 66 = 14 seats empty.
    4. 55 − 18 = 37. Take away 20 to get 35, add 2. 37 children.

11. Answer to Question 11

    1. 14 + 23 + 19 = 37 + 19 = 56 goals.
    2. 31 + 28 + 15 = 59 + 15 = 74 goals.
    3. Blue wins. 74 − 56 = 18 goals.

12. Answer to Question 12

    1. 63 − 24 = 39. Take away 20 to get 43, then take away 4. 39 apples.
    2. 28 − 9 = 19. 19 pears.
    3. 37 + 30 = 67 plums.
    4. 39 + 19 = 58 and 58 + 67 = 125. There are 125 pieces of fruit (apples, pears and plums).

13. Answer to Question 13

    1. 35 + 25 + 20 = 60 + 20 = 80p.
    2. 50 + 80 = 130p.
    3. 85 + 90 = 175. Add 100 then take away 10. 175p.
    4. 200 − 175 = 25p.

14. Answer to Question 14

    1. 28 + 35 = 63 pages. Ones: 8 + 5 = 13, carry 1. Tens: 2 + 3 + 1 = 6.
    2. 63 + 17 = 80 pages.
    3. 96 − 80 = 16 pages.
    4. Half of 96 is 48 and 80 is bigger than 48. Yes, Sam is right.

15. Answer to Question 15

    1. Red: 24 + 31 + 18 = 55 + 18 = 73. Blue: 35 + 22 + 27 = 57 + 27 = 84. Green: 28 + 29 + 30 = 57 + 30 = 87. Yellow: 19 + 38 + 25 = 57 + 25 = 82.
    2. Green has 87 and wins. Red has 73 and comes last.
    3. 87 − 73 = 14 points.
    4. Green has 87 and Blue has 84. 87 − 84 = 3, so Blue needs 3 more points to draw and 4 more points to win.
    5. Yellow: 82 + 12 = 94. 94 is more than 87, so yes, Yellow wins.

16. Answer to Question 16

    1. Cakes: 48 − 41 = 7. Biscuits: 36 − 29 = 7. Buns: 15 − 9 = 6.
    2. 7 + 20 = 27 biscuits.
    3. 7 + 27 + 6 = 34 + 6 = 40 items (7 cakes, 27 biscuits, 6 buns).
    4. 50 − 40 = 10 more items.

17. Answer to Question 17

    1. 24 + 19 + 33 = 43 + 33 = 76 bricks.
    2. Sara has 85 and Max has 76. 85 − 76 = 9. Sara has 9 more bricks.
    3. 85 − 17 = 68 bricks.
    4. Max has 76 bricks and Sara has 68. 76 is bigger than 68, so Max has the taller tower, by 8 bricks.
    5. 90 − 76 = 14 bricks.

18. Answer to Question 18

    1. 45 + 18 + 27 = 63 + 27 = 90 pounds.
    2. 85 + 20 = 105 pounds.
    3. 105 − 90 = 15 pounds.
    4. 12 + 15 = 27 pounds. She has only 15 pounds left and 27 is more than 15. No, she needs 12 pounds more: 27 − 15 = 12.

19. Answer to Question 19

    1. 38 + 29 = 67 stamps. Ones: 8 + 9 = 17, carry 1. Tens: 3 + 2 + 1 = 6.
    2. 67 − 16 + 9 = 51 + 9 = 60 stamps.
    3. 54 + 16 − 9 = 70 − 9 = 61 stamps.
    4. Idris has 61 and Noor has 60. Idris has 1 more.
    5. 60 + 61 = 121 stamps. Before: 67 + 54 = 121. The total is the same because stamps only move between them.

20. Answer to Question 20

    1. 34 + 28 + 25 = 62 + 25 = 87 metres.
    2. 34 + 28 = 62 metres.
    3. 87 + 62 = 149 metres.
    4. 150 − 149 = 1. The children walk 149 metres, which is less than 150, so she is not right (it is 1 metre short).

21. Answer to Question 21

    1. 30 and 70 differ by 40, which is too big. 32 and 68 differ by 68 − 32 = 36 and 32 + 68 = 100. The numbers are 32 and 68.
    2. Work backwards. 60 + 15 = 75. Then 75 − 28 = 47. The number was 47. Check: 47 + 28 = 75 and 75 − 15 = 60.
    3. Put the biggest digits in the tens place: 7 and 5. Put the others in the ones place: 4 and 2. 74 + 52 = 126 or 72 + 54 = 126. The biggest total is 126.