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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 462 · 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. 1.280 + 89 =
  2. 2.94 + 97 =
  3. 3.80 + 17 =
  4. 4.38 + 77 =
  5. 5.40 + 67 =
  6. 6.135 + 39 =
  7. 7.175 + 77 =
  8. 8.118 + 18 =
  9. 9.214 + 88 =
  10. 10.332 + 99 =
  11. 11.294 + 68 =
  12. 12.399 + 48 =
  13. 13.285 + 68 =
  14. 14.377 + 67 =
  15. 15.230 + 28 =
  16. 16.382 + 79 =
  17. 17.33 + 38 =
  18. 18.274 + 39 =
  19. 19.492 + 58 =
  20. 20.499 + 49 =
  21. 21.339 + 99 =
  22. 22.101 + 68 =
  23. 23.277 + 88 =
  24. 24.27 + 67 =
  25. 25.446 + 68 =
  26. 26.372 + 37 =
  27. 27.136 + 57 =
  28. 28.394 + 78 =
  29. 29.216 + 38 =
  30. 30.152 + 39 =
  31. 31.375 + 39 =
  32. 32.135 + 78 =
  33. 33.136 + 79 =
  34. 34.415 + 29 =
  35. 35.470 + 79 =
  36. 36.242 + 58 =
  37. 37.75 + 19 =
  38. 38.278 + 98 =
  39. 39.93 + 19 =
  40. 40.202 + 67 =

Answer key

  1. 369
  2. 191
  3. 97
  4. 115
  5. 107
  6. 174
  7. 252
  8. 136
  9. 302
  10. 431
  11. 362
  12. 447
  13. 353
  14. 444
  15. 258
  16. 461
  17. 71
  18. 313
  19. 550
  20. 548
  21. 438
  22. 169
  23. 365
  24. 94
  25. 514
  26. 409
  27. 193
  28. 472
  29. 254
  30. 191
  31. 414
  32. 213
  33. 215
  34. 444
  35. 549
  36. 300
  37. 94
  38. 376
  39. 112
  40. 269

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