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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 723 · 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. 1.247 + 47 =
  2. 2.28 + 57 =
  3. 3.472 + 78 =
  4. 4.86 + 19 =
  5. 5.437 + 58 =
  6. 6.188 + 59 =
  7. 7.433 + 88 =
  8. 8.269 + 67 =
  9. 9.381 + 19 =
  10. 10.209 + 77 =
  11. 11.101 + 29 =
  12. 12.27 + 59 =
  13. 13.332 + 48 =
  14. 14.472 + 47 =
  15. 15.360 + 68 =
  16. 16.114 + 77 =
  17. 17.288 + 18 =
  18. 18.104 + 47 =
  19. 19.205 + 48 =
  20. 20.400 + 97 =
  21. 21.110 + 59 =
  22. 22.236 + 77 =
  23. 23.161 + 17 =
  24. 24.348 + 87 =
  25. 25.35 + 59 =
  26. 26.238 + 57 =
  27. 27.224 + 67 =
  28. 28.400 + 59 =
  29. 29.204 + 87 =
  30. 30.459 + 89 =
  31. 31.381 + 29 =
  32. 32.277 + 37 =
  33. 33.470 + 48 =
  34. 34.47 + 67 =
  35. 35.195 + 68 =
  36. 36.148 + 28 =
  37. 37.108 + 79 =
  38. 38.474 + 47 =
  39. 39.108 + 28 =
  40. 40.243 + 87 =

Answer key

  1. 294
  2. 85
  3. 550
  4. 105
  5. 495
  6. 247
  7. 521
  8. 336
  9. 400
  10. 286
  11. 130
  12. 86
  13. 380
  14. 519
  15. 428
  16. 191
  17. 306
  18. 151
  19. 253
  20. 497
  21. 169
  22. 313
  23. 178
  24. 435
  25. 94
  26. 295
  27. 291
  28. 459
  29. 291
  30. 548
  31. 410
  32. 314
  33. 518
  34. 114
  35. 263
  36. 176
  37. 187
  38. 521
  39. 136
  40. 330

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