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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 342 · 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. 1.136 + 88 =
  2. 2.460 + 49 =
  3. 3.25 + 17 =
  4. 4.379 + 88 =
  5. 5.93 + 28 =
  6. 6.178 + 37 =
  7. 7.433 + 78 =
  8. 8.249 + 67 =
  9. 9.457 + 27 =
  10. 10.427 + 97 =
  11. 11.237 + 58 =
  12. 12.209 + 87 =
  13. 13.320 + 28 =
  14. 14.146 + 17 =
  15. 15.314 + 49 =
  16. 16.130 + 39 =
  17. 17.304 + 87 =
  18. 18.187 + 68 =
  19. 19.78 + 59 =
  20. 20.228 + 69 =
  21. 21.118 + 17 =
  22. 22.107 + 68 =
  23. 23.272 + 29 =
  24. 24.377 + 89 =
  25. 25.486 + 28 =
  26. 26.194 + 47 =
  27. 27.72 + 48 =
  28. 28.67 + 79 =
  29. 29.436 + 27 =
  30. 30.87 + 79 =
  31. 31.164 + 79 =
  32. 32.343 + 49 =
  33. 33.102 + 79 =
  34. 34.158 + 97 =
  35. 35.347 + 98 =
  36. 36.89 + 27 =
  37. 37.157 + 37 =
  38. 38.416 + 49 =
  39. 39.31 + 18 =
  40. 40.419 + 18 =

Answer key

  1. 224
  2. 509
  3. 42
  4. 467
  5. 121
  6. 215
  7. 511
  8. 316
  9. 484
  10. 524
  11. 295
  12. 296
  13. 348
  14. 163
  15. 363
  16. 169
  17. 391
  18. 255
  19. 137
  20. 297
  21. 135
  22. 175
  23. 301
  24. 466
  25. 514
  26. 241
  27. 120
  28. 146
  29. 463
  30. 166
  31. 243
  32. 392
  33. 181
  34. 255
  35. 445
  36. 116
  37. 194
  38. 465
  39. 49
  40. 437

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