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Adding 9, 19 and 99 Mental Maths Worksheet

Mental maths lesson 4: Add and take away 9, 19 and 99 · Set 565 · 40 questions
TalentJR

How to do it in your head (Round and adjust): Add 9, 19, 99: add 10, 20, 100, then take 1 away. Take away 9, 19, 99: take away 10, 20, 100, then add 1 back. Ask yourself: did I use too much or too little?

NameDateTime takenScore ___ / 40
  1. 1.16 + 19 =
  2. 2.39 − 9 =
  3. 3.49 + 19 =
  4. 4.12 + 19 =
  5. 5.40 − 29 =
  6. 6.79 + 29 =
  7. 7.51 − 19 =
  8. 8.202 − 99 =
  9. 9.71 + 29 =
  10. 10.139 + 99 =
  11. 11.27 − 9 =
  12. 12.51 + 29 =
  13. 13.157 + 99 =
  14. 14.55 − 19 =
  15. 15.85 − 29 =
  16. 16.61 + 29 =
  17. 17.562 − 99 =
  18. 18.75 + 19 =
  19. 19.17 − 9 =
  20. 20.68 − 9 =
  21. 21.52 + 9 =
  22. 22.16 − 9 =
  23. 23.12 − 9 =
  24. 24.758 − 99 =
  25. 25.41 + 9 =
  26. 26.22 + 19 =
  27. 27.55 + 19 =
  28. 28.529 + 99 =
  29. 29.367 + 99 =
  30. 30.42 + 9 =
  31. 31.23 + 29 =
  32. 32.68 + 19 =
  33. 33.52 − 19 =
  34. 34.49 + 29 =
  35. 35.19 + 9 =
  36. 36.80 − 9 =
  37. 37.486 + 99 =
  38. 38.13 − 9 =
  39. 39.45 − 19 =
  40. 40.477 + 99 =

Answer key

  1. 35
  2. 30
  3. 68
  4. 31
  5. 11
  6. 108
  7. 32
  8. 103
  9. 100
  10. 238
  11. 18
  12. 80
  13. 256
  14. 36
  15. 56
  16. 90
  17. 463
  18. 94
  19. 8
  20. 59
  21. 61
  22. 7
  23. 3
  24. 659
  25. 50
  26. 41
  27. 74
  28. 628
  29. 466
  30. 51
  31. 52
  32. 87
  33. 33
  34. 78
  35. 28
  36. 71
  37. 585
  38. 4
  39. 26
  40. 576

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