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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 650 · 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. 1.396 + 58 =
  2. 2.275 + 38 =
  3. 3.319 + 17 =
  4. 4.209 + 29 =
  5. 5.485 + 87 =
  6. 6.199 + 58 =
  7. 7.199 + 87 =
  8. 8.347 + 78 =
  9. 9.303 + 97 =
  10. 10.392 + 58 =
  11. 11.195 + 87 =
  12. 12.75 + 89 =
  13. 13.476 + 27 =
  14. 14.45 + 29 =
  15. 15.161 + 38 =
  16. 16.291 + 77 =
  17. 17.120 + 57 =
  18. 18.26 + 39 =
  19. 19.474 + 17 =
  20. 20.33 + 49 =
  21. 21.212 + 87 =
  22. 22.186 + 47 =
  23. 23.288 + 28 =
  24. 24.465 + 97 =
  25. 25.300 + 29 =
  26. 26.211 + 49 =
  27. 27.82 + 18 =
  28. 28.31 + 17 =
  29. 29.378 + 89 =
  30. 30.84 + 67 =
  31. 31.49 + 28 =
  32. 32.412 + 37 =
  33. 33.177 + 67 =
  34. 34.178 + 57 =
  35. 35.184 + 59 =
  36. 36.224 + 29 =
  37. 37.293 + 19 =
  38. 38.303 + 79 =
  39. 39.294 + 87 =
  40. 40.248 + 37 =

Answer key

  1. 454
  2. 313
  3. 336
  4. 238
  5. 572
  6. 257
  7. 286
  8. 425
  9. 400
  10. 450
  11. 282
  12. 164
  13. 503
  14. 74
  15. 199
  16. 368
  17. 177
  18. 65
  19. 491
  20. 82
  21. 299
  22. 233
  23. 316
  24. 562
  25. 329
  26. 260
  27. 100
  28. 48
  29. 467
  30. 151
  31. 77
  32. 449
  33. 244
  34. 235
  35. 243
  36. 253
  37. 312
  38. 382
  39. 381
  40. 285

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