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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 284 · 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. 1.137 + 48 =
  2. 2.89 + 38 =
  3. 3.225 + 17 =
  4. 4.438 + 49 =
  5. 5.114 + 97 =
  6. 6.351 + 38 =
  7. 7.496 + 29 =
  8. 8.486 + 27 =
  9. 9.269 + 39 =
  10. 10.150 + 47 =
  11. 11.250 + 39 =
  12. 12.163 + 68 =
  13. 13.188 + 77 =
  14. 14.114 + 37 =
  15. 15.321 + 59 =
  16. 16.87 + 59 =
  17. 17.140 + 97 =
  18. 18.115 + 87 =
  19. 19.47 + 87 =
  20. 20.365 + 17 =
  21. 21.445 + 18 =
  22. 22.255 + 28 =
  23. 23.236 + 39 =
  24. 24.32 + 98 =
  25. 25.471 + 17 =
  26. 26.340 + 88 =
  27. 27.128 + 28 =
  28. 28.463 + 17 =
  29. 29.125 + 58 =
  30. 30.142 + 69 =
  31. 31.230 + 19 =
  32. 32.331 + 97 =
  33. 33.342 + 28 =
  34. 34.439 + 69 =
  35. 35.59 + 37 =
  36. 36.199 + 88 =
  37. 37.296 + 68 =
  38. 38.306 + 19 =
  39. 39.252 + 98 =
  40. 40.74 + 17 =

Answer key

  1. 185
  2. 127
  3. 242
  4. 487
  5. 211
  6. 389
  7. 525
  8. 513
  9. 308
  10. 197
  11. 289
  12. 231
  13. 265
  14. 151
  15. 380
  16. 146
  17. 237
  18. 202
  19. 134
  20. 382
  21. 463
  22. 283
  23. 275
  24. 130
  25. 488
  26. 428
  27. 156
  28. 480
  29. 183
  30. 211
  31. 249
  32. 428
  33. 370
  34. 508
  35. 96
  36. 287
  37. 364
  38. 325
  39. 350
  40. 91

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