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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 169 · 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. 1.434 + 28 =
  2. 2.496 + 67 =
  3. 3.280 + 57 =
  4. 4.375 + 39 =
  5. 5.112 + 78 =
  6. 6.152 + 38 =
  7. 7.150 + 77 =
  8. 8.200 + 68 =
  9. 9.413 + 38 =
  10. 10.193 + 88 =
  11. 11.296 + 17 =
  12. 12.410 + 37 =
  13. 13.49 + 38 =
  14. 14.58 + 19 =
  15. 15.461 + 29 =
  16. 16.359 + 98 =
  17. 17.141 + 18 =
  18. 18.145 + 77 =
  19. 19.145 + 98 =
  20. 20.460 + 49 =
  21. 21.112 + 79 =
  22. 22.347 + 37 =
  23. 23.355 + 28 =
  24. 24.441 + 18 =
  25. 25.191 + 98 =
  26. 26.390 + 88 =
  27. 27.242 + 39 =
  28. 28.398 + 68 =
  29. 29.140 + 37 =
  30. 30.30 + 48 =
  31. 31.458 + 29 =
  32. 32.152 + 27 =
  33. 33.418 + 77 =
  34. 34.97 + 37 =
  35. 35.44 + 68 =
  36. 36.76 + 27 =
  37. 37.200 + 58 =
  38. 38.149 + 68 =
  39. 39.80 + 27 =
  40. 40.485 + 57 =

Answer key

  1. 462
  2. 563
  3. 337
  4. 414
  5. 190
  6. 190
  7. 227
  8. 268
  9. 451
  10. 281
  11. 313
  12. 447
  13. 87
  14. 77
  15. 490
  16. 457
  17. 159
  18. 222
  19. 243
  20. 509
  21. 191
  22. 384
  23. 383
  24. 459
  25. 289
  26. 478
  27. 281
  28. 466
  29. 177
  30. 78
  31. 487
  32. 179
  33. 495
  34. 134
  35. 112
  36. 103
  37. 258
  38. 217
  39. 107
  40. 542

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