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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 415 · 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 + 38 =
  2. 2.338 + 77 =
  3. 3.178 + 27 =
  4. 4.129 + 27 =
  5. 5.331 + 17 =
  6. 6.129 + 19 =
  7. 7.499 + 57 =
  8. 8.190 + 88 =
  9. 9.357 + 68 =
  10. 10.78 + 58 =
  11. 11.172 + 57 =
  12. 12.402 + 68 =
  13. 13.276 + 98 =
  14. 14.258 + 28 =
  15. 15.369 + 47 =
  16. 16.490 + 78 =
  17. 17.63 + 37 =
  18. 18.204 + 49 =
  19. 19.40 + 37 =
  20. 20.359 + 69 =
  21. 21.267 + 28 =
  22. 22.492 + 38 =
  23. 23.469 + 99 =
  24. 24.25 + 69 =
  25. 25.204 + 19 =
  26. 26.247 + 67 =
  27. 27.165 + 37 =
  28. 28.264 + 48 =
  29. 29.132 + 98 =
  30. 30.394 + 97 =
  31. 31.418 + 69 =
  32. 32.360 + 57 =
  33. 33.153 + 78 =
  34. 34.361 + 98 =
  35. 35.62 + 88 =
  36. 36.252 + 39 =
  37. 37.52 + 87 =
  38. 38.98 + 47 =
  39. 39.141 + 98 =
  40. 40.235 + 57 =

Answer key

  1. 472
  2. 415
  3. 205
  4. 156
  5. 348
  6. 148
  7. 556
  8. 278
  9. 425
  10. 136
  11. 229
  12. 470
  13. 374
  14. 286
  15. 416
  16. 568
  17. 100
  18. 253
  19. 77
  20. 428
  21. 295
  22. 530
  23. 568
  24. 94
  25. 223
  26. 314
  27. 202
  28. 312
  29. 230
  30. 491
  31. 487
  32. 417
  33. 231
  34. 459
  35. 150
  36. 291
  37. 139
  38. 145
  39. 239
  40. 292

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