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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 267 · 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. 1.345 + 89 =
  2. 2.404 + 79 =
  3. 3.454 + 98 =
  4. 4.236 + 69 =
  5. 5.91 + 19 =
  6. 6.250 + 79 =
  7. 7.355 + 78 =
  8. 8.315 + 27 =
  9. 9.408 + 38 =
  10. 10.365 + 28 =
  11. 11.213 + 77 =
  12. 12.492 + 47 =
  13. 13.229 + 77 =
  14. 14.35 + 68 =
  15. 15.242 + 67 =
  16. 16.294 + 48 =
  17. 17.136 + 77 =
  18. 18.188 + 87 =
  19. 19.367 + 98 =
  20. 20.370 + 27 =
  21. 21.476 + 68 =
  22. 22.188 + 97 =
  23. 23.434 + 17 =
  24. 24.429 + 89 =
  25. 25.439 + 39 =
  26. 26.218 + 68 =
  27. 27.327 + 38 =
  28. 28.45 + 68 =
  29. 29.335 + 57 =
  30. 30.159 + 37 =
  31. 31.139 + 18 =
  32. 32.32 + 27 =
  33. 33.346 + 27 =
  34. 34.483 + 68 =
  35. 35.445 + 39 =
  36. 36.225 + 67 =
  37. 37.151 + 17 =
  38. 38.295 + 18 =
  39. 39.478 + 48 =
  40. 40.104 + 67 =

Answer key

  1. 434
  2. 483
  3. 552
  4. 305
  5. 110
  6. 329
  7. 433
  8. 342
  9. 446
  10. 393
  11. 290
  12. 539
  13. 306
  14. 103
  15. 309
  16. 342
  17. 213
  18. 275
  19. 465
  20. 397
  21. 544
  22. 285
  23. 451
  24. 518
  25. 478
  26. 286
  27. 365
  28. 113
  29. 392
  30. 196
  31. 157
  32. 59
  33. 373
  34. 551
  35. 484
  36. 292
  37. 168
  38. 313
  39. 526
  40. 171

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