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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 909 · 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. 1.41 − 19 =
  2. 2.76 − 29 =
  3. 3.55 − 19 =
  4. 4.391 − 99 =
  5. 5.125 + 99 =
  6. 6.64 + 29 =
  7. 7.98 − 29 =
  8. 8.45 + 19 =
  9. 9.153 + 99 =
  10. 10.58 − 29 =
  11. 11.39 − 9 =
  12. 12.141 + 99 =
  13. 13.79 + 9 =
  14. 14.296 − 99 =
  15. 15.70 − 9 =
  16. 16.12 + 9 =
  17. 17.43 − 9 =
  18. 18.54 − 9 =
  19. 19.57 − 9 =
  20. 20.638 + 99 =
  21. 21.310 + 99 =
  22. 22.36 − 19 =
  23. 23.41 − 29 =
  24. 24.37 − 29 =
  25. 25.22 + 9 =
  26. 26.69 − 9 =
  27. 27.74 + 9 =
  28. 28.619 + 99 =
  29. 29.34 + 19 =
  30. 30.30 − 9 =
  31. 31.18 − 9 =
  32. 32.350 + 99 =
  33. 33.31 + 29 =
  34. 34.53 − 29 =
  35. 35.27 − 9 =
  36. 36.43 + 9 =
  37. 37.44 + 9 =
  38. 38.247 − 99 =
  39. 39.51 + 19 =
  40. 40.26 + 29 =

Answer key

  1. 22
  2. 47
  3. 36
  4. 292
  5. 224
  6. 93
  7. 69
  8. 64
  9. 252
  10. 29
  11. 30
  12. 240
  13. 88
  14. 197
  15. 61
  16. 21
  17. 34
  18. 45
  19. 48
  20. 737
  21. 409
  22. 17
  23. 12
  24. 8
  25. 31
  26. 60
  27. 83
  28. 718
  29. 53
  30. 21
  31. 9
  32. 449
  33. 60
  34. 24
  35. 18
  36. 52
  37. 53
  38. 148
  39. 70
  40. 55

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