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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 794 · 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. 1.74 − 19 =
  2. 2.17 − 9 =
  3. 3.58 − 19 =
  4. 4.198 − 99 =
  5. 5.40 − 29 =
  6. 6.48 − 29 =
  7. 7.77 − 9 =
  8. 8.31 + 9 =
  9. 9.42 + 29 =
  10. 10.17 + 9 =
  11. 11.69 − 19 =
  12. 12.66 + 19 =
  13. 13.33 − 29 =
  14. 14.58 − 29 =
  15. 15.24 + 19 =
  16. 16.498 + 99 =
  17. 17.71 − 29 =
  18. 18.43 − 9 =
  19. 19.47 + 9 =
  20. 20.66 − 19 =
  21. 21.56 + 29 =
  22. 22.791 + 99 =
  23. 23.199 − 99 =
  24. 24.194 + 99 =
  25. 25.25 − 9 =
  26. 26.304 + 99 =
  27. 27.60 + 9 =
  28. 28.100 − 29 =
  29. 29.53 + 19 =
  30. 30.550 + 99 =
  31. 31.72 + 9 =
  32. 32.35 − 29 =
  33. 33.756 + 99 =
  34. 34.508 − 99 =
  35. 35.87 − 19 =
  36. 36.51 + 29 =
  37. 37.56 − 19 =
  38. 38.579 − 99 =
  39. 39.27 − 19 =
  40. 40.15 + 19 =

Answer key

  1. 55
  2. 8
  3. 39
  4. 99
  5. 11
  6. 19
  7. 68
  8. 40
  9. 71
  10. 26
  11. 50
  12. 85
  13. 4
  14. 29
  15. 43
  16. 597
  17. 42
  18. 34
  19. 56
  20. 47
  21. 85
  22. 890
  23. 100
  24. 293
  25. 16
  26. 403
  27. 69
  28. 71
  29. 72
  30. 649
  31. 81
  32. 6
  33. 855
  34. 409
  35. 68
  36. 80
  37. 37
  38. 480
  39. 8
  40. 34

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