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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 354 · 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. 1.19 − 9 =
  2. 2.13 − 9 =
  3. 3.392 + 99 =
  4. 4.80 − 9 =
  5. 5.61 − 29 =
  6. 6.109 − 29 =
  7. 7.62 − 19 =
  8. 8.39 + 9 =
  9. 9.44 − 29 =
  10. 10.36 − 19 =
  11. 11.40 − 29 =
  12. 12.60 − 29 =
  13. 13.491 − 99 =
  14. 14.460 + 99 =
  15. 15.85 − 29 =
  16. 16.65 + 19 =
  17. 17.15 + 19 =
  18. 18.40 − 19 =
  19. 19.13 + 9 =
  20. 20.96 − 29 =
  21. 21.186 − 99 =
  22. 22.29 + 9 =
  23. 23.58 + 9 =
  24. 24.54 + 29 =
  25. 25.22 + 19 =
  26. 26.87 − 9 =
  27. 27.229 − 99 =
  28. 28.55 − 29 =
  29. 29.70 + 9 =
  30. 30.21 + 19 =
  31. 31.50 + 19 =
  32. 32.82 − 29 =
  33. 33.51 + 19 =
  34. 34.445 − 99 =
  35. 35.55 − 9 =
  36. 36.57 − 29 =
  37. 37.494 − 99 =
  38. 38.141 + 99 =
  39. 39.35 + 9 =
  40. 40.30 + 29 =

Answer key

  1. 10
  2. 4
  3. 491
  4. 71
  5. 32
  6. 80
  7. 43
  8. 48
  9. 15
  10. 17
  11. 11
  12. 31
  13. 392
  14. 559
  15. 56
  16. 84
  17. 34
  18. 21
  19. 22
  20. 67
  21. 87
  22. 38
  23. 67
  24. 83
  25. 41
  26. 78
  27. 130
  28. 26
  29. 79
  30. 40
  31. 69
  32. 53
  33. 70
  34. 346
  35. 46
  36. 28
  37. 395
  38. 240
  39. 44
  40. 59

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