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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 394 · 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. 1.89 + 68 =
  2. 2.88 + 17 =
  3. 3.199 + 79 =
  4. 4.143 + 97 =
  5. 5.180 + 68 =
  6. 6.43 + 29 =
  7. 7.310 + 18 =
  8. 8.103 + 37 =
  9. 9.477 + 47 =
  10. 10.377 + 88 =
  11. 11.332 + 88 =
  12. 12.28 + 89 =
  13. 13.373 + 87 =
  14. 14.460 + 28 =
  15. 15.493 + 69 =
  16. 16.183 + 27 =
  17. 17.327 + 79 =
  18. 18.182 + 77 =
  19. 19.380 + 19 =
  20. 20.241 + 17 =
  21. 21.195 + 17 =
  22. 22.330 + 97 =
  23. 23.325 + 48 =
  24. 24.163 + 69 =
  25. 25.247 + 87 =
  26. 26.203 + 88 =
  27. 27.461 + 27 =
  28. 28.318 + 67 =
  29. 29.420 + 27 =
  30. 30.480 + 49 =
  31. 31.394 + 39 =
  32. 32.109 + 58 =
  33. 33.474 + 68 =
  34. 34.127 + 38 =
  35. 35.327 + 17 =
  36. 36.248 + 77 =
  37. 37.487 + 97 =
  38. 38.25 + 68 =
  39. 39.474 + 69 =
  40. 40.58 + 48 =

Answer key

  1. 157
  2. 105
  3. 278
  4. 240
  5. 248
  6. 72
  7. 328
  8. 140
  9. 524
  10. 465
  11. 420
  12. 117
  13. 460
  14. 488
  15. 562
  16. 210
  17. 406
  18. 259
  19. 399
  20. 258
  21. 212
  22. 427
  23. 373
  24. 232
  25. 334
  26. 291
  27. 488
  28. 385
  29. 447
  30. 529
  31. 433
  32. 167
  33. 542
  34. 165
  35. 344
  36. 325
  37. 584
  38. 93
  39. 543
  40. 106

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