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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 456 · 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. 1.62 + 9 =
  2. 2.13 − 9 =
  3. 3.37 − 19 =
  4. 4.72 − 29 =
  5. 5.25 + 9 =
  6. 6.61 + 29 =
  7. 7.65 − 19 =
  8. 8.78 + 9 =
  9. 9.24 + 29 =
  10. 10.60 − 9 =
  11. 11.92 − 19 =
  12. 12.302 − 99 =
  13. 13.56 − 29 =
  14. 14.23 + 19 =
  15. 15.54 + 19 =
  16. 16.29 − 9 =
  17. 17.44 − 29 =
  18. 18.97 − 29 =
  19. 19.46 − 29 =
  20. 20.12 + 19 =
  21. 21.65 − 9 =
  22. 22.15 − 9 =
  23. 23.33 − 29 =
  24. 24.193 + 99 =
  25. 25.164 + 99 =
  26. 26.605 − 99 =
  27. 27.74 − 29 =
  28. 28.29 − 19 =
  29. 29.62 + 29 =
  30. 30.62 + 19 =
  31. 31.30 + 29 =
  32. 32.30 − 9 =
  33. 33.63 − 9 =
  34. 34.505 − 99 =
  35. 35.460 − 99 =
  36. 36.631 + 99 =
  37. 37.29 + 19 =
  38. 38.13 + 29 =
  39. 39.22 − 9 =
  40. 40.94 − 29 =

Answer key

  1. 71
  2. 4
  3. 18
  4. 43
  5. 34
  6. 90
  7. 46
  8. 87
  9. 53
  10. 51
  11. 73
  12. 203
  13. 27
  14. 42
  15. 73
  16. 20
  17. 15
  18. 68
  19. 17
  20. 31
  21. 56
  22. 6
  23. 4
  24. 292
  25. 263
  26. 506
  27. 45
  28. 10
  29. 91
  30. 81
  31. 59
  32. 21
  33. 54
  34. 406
  35. 361
  36. 730
  37. 48
  38. 42
  39. 13
  40. 65

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