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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 64 · 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. 1.115 + 57 =
  2. 2.86 + 48 =
  3. 3.111 + 49 =
  4. 4.350 + 37 =
  5. 5.109 + 29 =
  6. 6.279 + 77 =
  7. 7.221 + 99 =
  8. 8.146 + 27 =
  9. 9.374 + 38 =
  10. 10.453 + 39 =
  11. 11.239 + 77 =
  12. 12.191 + 58 =
  13. 13.74 + 19 =
  14. 14.206 + 49 =
  15. 15.208 + 28 =
  16. 16.208 + 18 =
  17. 17.326 + 29 =
  18. 18.254 + 49 =
  19. 19.111 + 79 =
  20. 20.128 + 17 =
  21. 21.230 + 57 =
  22. 22.209 + 38 =
  23. 23.232 + 89 =
  24. 24.52 + 19 =
  25. 25.48 + 89 =
  26. 26.215 + 68 =
  27. 27.206 + 17 =
  28. 28.491 + 37 =
  29. 29.491 + 37 =
  30. 30.412 + 48 =
  31. 31.424 + 68 =
  32. 32.296 + 77 =
  33. 33.25 + 18 =
  34. 34.388 + 39 =
  35. 35.346 + 39 =
  36. 36.273 + 49 =
  37. 37.377 + 97 =
  38. 38.229 + 37 =
  39. 39.67 + 37 =
  40. 40.73 + 97 =

Answer key

  1. 172
  2. 134
  3. 160
  4. 387
  5. 138
  6. 356
  7. 320
  8. 173
  9. 412
  10. 492
  11. 316
  12. 249
  13. 93
  14. 255
  15. 236
  16. 226
  17. 355
  18. 303
  19. 190
  20. 145
  21. 287
  22. 247
  23. 321
  24. 71
  25. 137
  26. 283
  27. 223
  28. 528
  29. 528
  30. 460
  31. 492
  32. 373
  33. 43
  34. 427
  35. 385
  36. 322
  37. 474
  38. 266
  39. 104
  40. 170

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