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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 339 · 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. 1.79 + 47 =
  2. 2.80 + 17 =
  3. 3.41 + 18 =
  4. 4.168 + 27 =
  5. 5.37 + 58 =
  6. 6.476 + 29 =
  7. 7.121 + 28 =
  8. 8.332 + 78 =
  9. 9.133 + 27 =
  10. 10.83 + 17 =
  11. 11.204 + 28 =
  12. 12.156 + 99 =
  13. 13.96 + 48 =
  14. 14.197 + 38 =
  15. 15.201 + 47 =
  16. 16.98 + 88 =
  17. 17.137 + 17 =
  18. 18.92 + 98 =
  19. 19.196 + 57 =
  20. 20.488 + 97 =
  21. 21.359 + 58 =
  22. 22.436 + 77 =
  23. 23.179 + 28 =
  24. 24.304 + 18 =
  25. 25.380 + 98 =
  26. 26.26 + 18 =
  27. 27.391 + 38 =
  28. 28.52 + 87 =
  29. 29.405 + 57 =
  30. 30.316 + 39 =
  31. 31.179 + 19 =
  32. 32.86 + 98 =
  33. 33.302 + 87 =
  34. 34.80 + 98 =
  35. 35.389 + 47 =
  36. 36.129 + 68 =
  37. 37.380 + 38 =
  38. 38.63 + 99 =
  39. 39.408 + 17 =
  40. 40.473 + 69 =

Answer key

  1. 126
  2. 97
  3. 59
  4. 195
  5. 95
  6. 505
  7. 149
  8. 410
  9. 160
  10. 100
  11. 232
  12. 255
  13. 144
  14. 235
  15. 248
  16. 186
  17. 154
  18. 190
  19. 253
  20. 585
  21. 417
  22. 513
  23. 207
  24. 322
  25. 478
  26. 44
  27. 429
  28. 139
  29. 462
  30. 355
  31. 198
  32. 184
  33. 389
  34. 178
  35. 436
  36. 197
  37. 418
  38. 162
  39. 425
  40. 542

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