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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 557 · 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. 1.389 + 57 =
  2. 2.299 + 37 =
  3. 3.440 + 39 =
  4. 4.363 + 68 =
  5. 5.162 + 77 =
  6. 6.226 + 37 =
  7. 7.427 + 97 =
  8. 8.452 + 59 =
  9. 9.210 + 79 =
  10. 10.333 + 29 =
  11. 11.124 + 17 =
  12. 12.193 + 47 =
  13. 13.275 + 48 =
  14. 14.462 + 27 =
  15. 15.174 + 18 =
  16. 16.342 + 28 =
  17. 17.133 + 79 =
  18. 18.319 + 37 =
  19. 19.28 + 18 =
  20. 20.93 + 69 =
  21. 21.478 + 77 =
  22. 22.141 + 39 =
  23. 23.471 + 39 =
  24. 24.384 + 59 =
  25. 25.466 + 88 =
  26. 26.34 + 97 =
  27. 27.128 + 17 =
  28. 28.121 + 99 =
  29. 29.318 + 19 =
  30. 30.403 + 19 =
  31. 31.443 + 88 =
  32. 32.218 + 39 =
  33. 33.130 + 39 =
  34. 34.295 + 67 =
  35. 35.229 + 58 =
  36. 36.213 + 37 =
  37. 37.218 + 99 =
  38. 38.489 + 37 =
  39. 39.236 + 18 =
  40. 40.26 + 98 =

Answer key

  1. 446
  2. 336
  3. 479
  4. 431
  5. 239
  6. 263
  7. 524
  8. 511
  9. 289
  10. 362
  11. 141
  12. 240
  13. 323
  14. 489
  15. 192
  16. 370
  17. 212
  18. 356
  19. 46
  20. 162
  21. 555
  22. 180
  23. 510
  24. 443
  25. 554
  26. 131
  27. 145
  28. 220
  29. 337
  30. 422
  31. 531
  32. 257
  33. 169
  34. 362
  35. 287
  36. 250
  37. 317
  38. 526
  39. 254
  40. 124

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