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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 672 · 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. 1.35 + 78 =
  2. 2.449 + 87 =
  3. 3.144 + 28 =
  4. 4.178 + 48 =
  5. 5.327 + 37 =
  6. 6.380 + 69 =
  7. 7.106 + 27 =
  8. 8.364 + 97 =
  9. 9.272 + 59 =
  10. 10.135 + 97 =
  11. 11.277 + 68 =
  12. 12.187 + 77 =
  13. 13.123 + 77 =
  14. 14.244 + 79 =
  15. 15.496 + 79 =
  16. 16.412 + 57 =
  17. 17.343 + 38 =
  18. 18.134 + 29 =
  19. 19.451 + 27 =
  20. 20.163 + 49 =
  21. 21.157 + 29 =
  22. 22.416 + 39 =
  23. 23.121 + 48 =
  24. 24.343 + 67 =
  25. 25.330 + 37 =
  26. 26.250 + 98 =
  27. 27.467 + 59 =
  28. 28.412 + 28 =
  29. 29.40 + 17 =
  30. 30.70 + 38 =
  31. 31.233 + 57 =
  32. 32.252 + 88 =
  33. 33.446 + 58 =
  34. 34.149 + 67 =
  35. 35.297 + 19 =
  36. 36.383 + 47 =
  37. 37.221 + 77 =
  38. 38.364 + 88 =
  39. 39.233 + 78 =
  40. 40.302 + 39 =

Answer key

  1. 113
  2. 536
  3. 172
  4. 226
  5. 364
  6. 449
  7. 133
  8. 461
  9. 331
  10. 232
  11. 345
  12. 264
  13. 200
  14. 323
  15. 575
  16. 469
  17. 381
  18. 163
  19. 478
  20. 212
  21. 186
  22. 455
  23. 169
  24. 410
  25. 367
  26. 348
  27. 526
  28. 440
  29. 57
  30. 108
  31. 290
  32. 340
  33. 504
  34. 216
  35. 316
  36. 430
  37. 298
  38. 452
  39. 311
  40. 341

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