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

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1. Answer to Question 1 (4 marks)

   1. 46 + 20 = 66, 66 + 9 = 75. (1 mark)
   2. 58 + 2 = 60, 60 + 5 = 65. (1 mark)
   3. 83 − 40 = 43, 43 − 1 = 42. (1 mark)
   4. 72 − 30 = 42, 42 − 8 = 34. (1 mark)

2. Answer to Question 2 (4 marks)

   1. Ones: 7 + 5 = 12, write 2 carry 1. Tens: 3 + 4 + 1 = 8. 82. Check: 82 − 45 = 37. (2 marks)
   2. Ones: 8 + 6 = 14, write 4 carry 1. Tens: 2 + 5 + 1 = 8. 84. Check: 84 − 56 = 28. (2 marks)

3. Answer to Question 3 (4 marks)

   1. Add the two days: 27 + 19. Adding 19 is the same as adding 20 and taking away 1: 27 + 20 = 47, then 47 − 1 = 46 teddy bears sold. (2 marks: 1 for choosing to add, 1 for 46)
   2. Take the sold bears away from 64: 64 − 40 = 24, then 24 − 6 = 18 teddy bears left. Check with the inverse: 18 + 46 = 64. (2 marks: 1 for the subtraction, 1 for 18)

4. Answer to Question 4 (4 marks)

   1. The missing number plus 36 makes 71, so find 71 − 36. 71 − 30 = 41 and 41 − 6 = 35. The missing number is 35. Check: 35 + 36 = 71. (1 mark)
   2. 90 take away the missing number leaves 54, so the missing number is 90 − 54: 90 − 50 = 40 and 40 − 4 = 36. Check: 90 − 36 = 54. (1 mark)
   3. Count on from 47 to 82 on a number line: 47 to 50 is 3, then 50 to 82 is 32. The difference is 3 + 32 = 35. (2 marks: 1 for a correct method, 1 for 35)

5. Answer to Question 5 (4 marks)

   1. Year 2 plant tulips and daffodils: 38 + 45. Add the tens, 30 + 40 = 70, and the ones, 8 + 5 = 13. 70 + 13 = 83 bulbs. (1 mark)
   2. Add Year 1's 24 bulbs: 83 + 20 = 103, then 103 + 4 = 107 bulbs. (1 mark)
   3. The rabbit digs up 16: 107 − 10 = 97, then 97 − 6 = 91 bulbs left. (1 mark)
   4. Count on from 91 to 100: that is 9 steps. So 9 bulbs are missing. Check: 91 + 9 = 100. (1 mark)

Total : 20 marks