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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 119 · 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. 1.52 − 19 =
  2. 2.99 − 29 =
  3. 3.67 − 19 =
  4. 4.62 − 29 =
  5. 5.37 − 29 =
  6. 6.29 − 9 =
  7. 7.56 − 9 =
  8. 8.17 + 29 =
  9. 9.40 + 9 =
  10. 10.717 − 99 =
  11. 11.622 − 99 =
  12. 12.64 + 29 =
  13. 13.21 + 9 =
  14. 14.60 + 29 =
  15. 15.245 + 99 =
  16. 16.24 + 19 =
  17. 17.23 − 19 =
  18. 18.27 + 29 =
  19. 19.75 − 29 =
  20. 20.82 − 9 =
  21. 21.80 + 19 =
  22. 22.30 + 29 =
  23. 23.73 + 19 =
  24. 24.31 − 19 =
  25. 25.73 − 19 =
  26. 26.41 + 29 =
  27. 27.29 + 9 =
  28. 28.46 − 19 =
  29. 29.77 + 19 =
  30. 30.62 − 9 =
  31. 31.24 + 9 =
  32. 32.22 − 9 =
  33. 33.13 + 19 =
  34. 34.44 + 9 =
  35. 35.757 + 99 =
  36. 36.60 − 9 =
  37. 37.57 − 29 =
  38. 38.82 − 19 =
  39. 39.36 − 19 =
  40. 40.84 − 19 =

Answer key

  1. 33
  2. 70
  3. 48
  4. 33
  5. 8
  6. 20
  7. 47
  8. 46
  9. 49
  10. 618
  11. 523
  12. 93
  13. 30
  14. 89
  15. 344
  16. 43
  17. 4
  18. 56
  19. 46
  20. 73
  21. 99
  22. 59
  23. 92
  24. 12
  25. 54
  26. 70
  27. 38
  28. 27
  29. 96
  30. 53
  31. 33
  32. 13
  33. 32
  34. 53
  35. 856
  36. 51
  37. 28
  38. 63
  39. 17
  40. 65

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