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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 111 · 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. 1.103 + 68 =
  2. 2.341 + 49 =
  3. 3.38 + 77 =
  4. 4.82 + 27 =
  5. 5.118 + 28 =
  6. 6.428 + 17 =
  7. 7.469 + 29 =
  8. 8.316 + 37 =
  9. 9.116 + 47 =
  10. 10.391 + 59 =
  11. 11.98 + 17 =
  12. 12.84 + 29 =
  13. 13.63 + 77 =
  14. 14.85 + 37 =
  15. 15.109 + 19 =
  16. 16.347 + 58 =
  17. 17.40 + 37 =
  18. 18.308 + 39 =
  19. 19.233 + 89 =
  20. 20.222 + 17 =
  21. 21.193 + 39 =
  22. 22.435 + 27 =
  23. 23.364 + 17 =
  24. 24.76 + 37 =
  25. 25.72 + 58 =
  26. 26.425 + 39 =
  27. 27.320 + 87 =
  28. 28.398 + 77 =
  29. 29.273 + 57 =
  30. 30.118 + 38 =
  31. 31.342 + 58 =
  32. 32.347 + 27 =
  33. 33.121 + 88 =
  34. 34.452 + 38 =
  35. 35.131 + 88 =
  36. 36.450 + 68 =
  37. 37.42 + 97 =
  38. 38.436 + 17 =
  39. 39.277 + 88 =
  40. 40.312 + 39 =

Answer key

  1. 171
  2. 390
  3. 115
  4. 109
  5. 146
  6. 445
  7. 498
  8. 353
  9. 163
  10. 450
  11. 115
  12. 113
  13. 140
  14. 122
  15. 128
  16. 405
  17. 77
  18. 347
  19. 322
  20. 239
  21. 232
  22. 462
  23. 381
  24. 113
  25. 130
  26. 464
  27. 407
  28. 475
  29. 330
  30. 156
  31. 400
  32. 374
  33. 209
  34. 490
  35. 219
  36. 518
  37. 139
  38. 453
  39. 365
  40. 351

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