← Add and take away 9, 19 and 99 lesson New set →

Adding 9, 19 and 99 Mental Maths Worksheet

Mental maths lesson 4: Add and take away 9, 19 and 99 · Set 344 · 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. 1.35 − 9 =
  2. 2.26 − 19 =
  3. 3.28 + 19 =
  4. 4.625 − 99 =
  5. 5.545 − 99 =
  6. 6.646 + 99 =
  7. 7.472 − 99 =
  8. 8.46 + 9 =
  9. 9.64 + 19 =
  10. 10.179 + 99 =
  11. 11.376 − 99 =
  12. 12.18 + 29 =
  13. 13.35 + 9 =
  14. 14.435 + 99 =
  15. 15.76 + 9 =
  16. 16.45 − 19 =
  17. 17.223 − 99 =
  18. 18.27 + 9 =
  19. 19.782 − 99 =
  20. 20.14 + 19 =
  21. 21.485 − 99 =
  22. 22.379 + 99 =
  23. 23.92 − 29 =
  24. 24.531 + 99 =
  25. 25.107 − 29 =
  26. 26.75 − 19 =
  27. 27.474 − 99 =
  28. 28.31 + 19 =
  29. 29.72 + 19 =
  30. 30.64 − 29 =
  31. 31.49 − 19 =
  32. 32.60 + 19 =
  33. 33.745 − 99 =
  34. 34.55 + 9 =
  35. 35.77 − 29 =
  36. 36.15 + 29 =
  37. 37.527 − 99 =
  38. 38.56 − 19 =
  39. 39.17 − 9 =
  40. 40.40 + 19 =

Answer key

  1. 26
  2. 7
  3. 47
  4. 526
  5. 446
  6. 745
  7. 373
  8. 55
  9. 83
  10. 278
  11. 277
  12. 47
  13. 44
  14. 534
  15. 85
  16. 26
  17. 124
  18. 36
  19. 683
  20. 33
  21. 386
  22. 478
  23. 63
  24. 630
  25. 78
  26. 56
  27. 375
  28. 50
  29. 91
  30. 35
  31. 30
  32. 79
  33. 646
  34. 64
  35. 48
  36. 44
  37. 428
  38. 37
  39. 8
  40. 59

Free mental maths lessons, practice and worksheets at talentjr.in/mental-maths