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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 201 · 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. 1.128 + 48 =
  2. 2.209 + 19 =
  3. 3.455 + 99 =
  4. 4.324 + 37 =
  5. 5.345 + 27 =
  6. 6.482 + 38 =
  7. 7.453 + 98 =
  8. 8.385 + 38 =
  9. 9.178 + 39 =
  10. 10.284 + 78 =
  11. 11.479 + 89 =
  12. 12.429 + 99 =
  13. 13.103 + 18 =
  14. 14.156 + 17 =
  15. 15.30 + 59 =
  16. 16.385 + 28 =
  17. 17.100 + 37 =
  18. 18.226 + 47 =
  19. 19.251 + 99 =
  20. 20.407 + 19 =
  21. 21.338 + 39 =
  22. 22.86 + 18 =
  23. 23.135 + 58 =
  24. 24.346 + 49 =
  25. 25.343 + 39 =
  26. 26.68 + 28 =
  27. 27.173 + 48 =
  28. 28.475 + 88 =
  29. 29.469 + 67 =
  30. 30.324 + 49 =
  31. 31.214 + 79 =
  32. 32.434 + 17 =
  33. 33.341 + 47 =
  34. 34.158 + 89 =
  35. 35.67 + 19 =
  36. 36.83 + 28 =
  37. 37.35 + 87 =
  38. 38.119 + 77 =
  39. 39.191 + 68 =
  40. 40.27 + 88 =

Answer key

  1. 176
  2. 228
  3. 554
  4. 361
  5. 372
  6. 520
  7. 551
  8. 423
  9. 217
  10. 362
  11. 568
  12. 528
  13. 121
  14. 173
  15. 89
  16. 413
  17. 137
  18. 273
  19. 350
  20. 426
  21. 377
  22. 104
  23. 193
  24. 395
  25. 382
  26. 96
  27. 221
  28. 563
  29. 536
  30. 373
  31. 293
  32. 451
  33. 388
  34. 247
  35. 86
  36. 111
  37. 122
  38. 196
  39. 259
  40. 115

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