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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 757 · 40 questions
TalentJR

The fast method (Round up, then fix): Round the number ending in 7, 8 or 9 up to the next ten: 39 → 40. Add the round number. Take away the extra you added (here 1).

NameDateTime takenScore ___ / 40
  1. 1.199 + 18 =
  2. 2.299 + 88 =
  3. 3.459 + 39 =
  4. 4.402 + 98 =
  5. 5.93 + 88 =
  6. 6.182 + 99 =
  7. 7.162 + 37 =
  8. 8.38 + 69 =
  9. 9.109 + 99 =
  10. 10.273 + 77 =
  11. 11.312 + 99 =
  12. 12.106 + 27 =
  13. 13.253 + 97 =
  14. 14.428 + 78 =
  15. 15.278 + 19 =
  16. 16.60 + 79 =
  17. 17.400 + 89 =
  18. 18.493 + 28 =
  19. 19.189 + 29 =
  20. 20.316 + 97 =
  21. 21.224 + 27 =
  22. 22.499 + 69 =
  23. 23.314 + 58 =
  24. 24.157 + 98 =
  25. 25.202 + 69 =
  26. 26.287 + 78 =
  27. 27.429 + 19 =
  28. 28.44 + 27 =
  29. 29.66 + 27 =
  30. 30.39 + 87 =
  31. 31.295 + 97 =
  32. 32.37 + 79 =
  33. 33.497 + 18 =
  34. 34.347 + 99 =
  35. 35.369 + 87 =
  36. 36.142 + 18 =
  37. 37.71 + 98 =
  38. 38.488 + 97 =
  39. 39.486 + 58 =
  40. 40.78 + 39 =

Answer key

  1. 217
  2. 387
  3. 498
  4. 500
  5. 181
  6. 281
  7. 199
  8. 107
  9. 208
  10. 350
  11. 411
  12. 133
  13. 350
  14. 506
  15. 297
  16. 139
  17. 489
  18. 521
  19. 218
  20. 413
  21. 251
  22. 568
  23. 372
  24. 255
  25. 271
  26. 365
  27. 448
  28. 71
  29. 93
  30. 126
  31. 392
  32. 116
  33. 515
  34. 446
  35. 456
  36. 160
  37. 169
  38. 585
  39. 544
  40. 117

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