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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 624 · 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. 1.290 + 38 =
  2. 2.444 + 17 =
  3. 3.168 + 79 =
  4. 4.37 + 77 =
  5. 5.295 + 37 =
  6. 6.300 + 19 =
  7. 7.42 + 98 =
  8. 8.221 + 17 =
  9. 9.215 + 67 =
  10. 10.411 + 88 =
  11. 11.424 + 79 =
  12. 12.474 + 97 =
  13. 13.118 + 58 =
  14. 14.101 + 77 =
  15. 15.353 + 28 =
  16. 16.392 + 97 =
  17. 17.158 + 39 =
  18. 18.156 + 49 =
  19. 19.319 + 19 =
  20. 20.399 + 77 =
  21. 21.159 + 69 =
  22. 22.475 + 98 =
  23. 23.129 + 98 =
  24. 24.151 + 97 =
  25. 25.141 + 69 =
  26. 26.392 + 59 =
  27. 27.101 + 17 =
  28. 28.207 + 19 =
  29. 29.378 + 37 =
  30. 30.338 + 77 =
  31. 31.245 + 29 =
  32. 32.469 + 59 =
  33. 33.223 + 48 =
  34. 34.263 + 89 =
  35. 35.244 + 69 =
  36. 36.389 + 58 =
  37. 37.385 + 28 =
  38. 38.104 + 87 =
  39. 39.113 + 87 =
  40. 40.315 + 97 =

Answer key

  1. 328
  2. 461
  3. 247
  4. 114
  5. 332
  6. 319
  7. 140
  8. 238
  9. 282
  10. 499
  11. 503
  12. 571
  13. 176
  14. 178
  15. 381
  16. 489
  17. 197
  18. 205
  19. 338
  20. 476
  21. 228
  22. 573
  23. 227
  24. 248
  25. 210
  26. 451
  27. 118
  28. 226
  29. 415
  30. 415
  31. 274
  32. 528
  33. 271
  34. 352
  35. 313
  36. 447
  37. 413
  38. 191
  39. 200
  40. 412

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