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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 637 · 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. 1.186 + 98 =
  2. 2.420 + 47 =
  3. 3.333 + 48 =
  4. 4.322 + 77 =
  5. 5.54 + 77 =
  6. 6.245 + 78 =
  7. 7.316 + 47 =
  8. 8.221 + 89 =
  9. 9.362 + 59 =
  10. 10.224 + 27 =
  11. 11.79 + 59 =
  12. 12.312 + 79 =
  13. 13.269 + 48 =
  14. 14.157 + 37 =
  15. 15.397 + 27 =
  16. 16.349 + 59 =
  17. 17.204 + 78 =
  18. 18.235 + 99 =
  19. 19.188 + 78 =
  20. 20.287 + 19 =
  21. 21.81 + 29 =
  22. 22.168 + 67 =
  23. 23.363 + 19 =
  24. 24.111 + 98 =
  25. 25.344 + 28 =
  26. 26.467 + 79 =
  27. 27.189 + 68 =
  28. 28.440 + 27 =
  29. 29.450 + 77 =
  30. 30.140 + 37 =
  31. 31.342 + 68 =
  32. 32.409 + 19 =
  33. 33.106 + 39 =
  34. 34.55 + 48 =
  35. 35.368 + 68 =
  36. 36.187 + 19 =
  37. 37.61 + 89 =
  38. 38.217 + 28 =
  39. 39.201 + 67 =
  40. 40.418 + 17 =

Answer key

  1. 284
  2. 467
  3. 381
  4. 399
  5. 131
  6. 323
  7. 363
  8. 310
  9. 421
  10. 251
  11. 138
  12. 391
  13. 317
  14. 194
  15. 424
  16. 408
  17. 282
  18. 334
  19. 266
  20. 306
  21. 110
  22. 235
  23. 382
  24. 209
  25. 372
  26. 546
  27. 257
  28. 467
  29. 527
  30. 177
  31. 410
  32. 428
  33. 145
  34. 103
  35. 436
  36. 206
  37. 150
  38. 245
  39. 268
  40. 435

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