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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 361 · 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. 1.60 + 17 =
  2. 2.432 + 88 =
  3. 3.178 + 29 =
  4. 4.437 + 28 =
  5. 5.138 + 27 =
  6. 6.59 + 17 =
  7. 7.346 + 28 =
  8. 8.419 + 19 =
  9. 9.385 + 38 =
  10. 10.155 + 17 =
  11. 11.162 + 67 =
  12. 12.97 + 29 =
  13. 13.223 + 38 =
  14. 14.167 + 99 =
  15. 15.367 + 27 =
  16. 16.420 + 88 =
  17. 17.63 + 88 =
  18. 18.418 + 19 =
  19. 19.218 + 78 =
  20. 20.51 + 47 =
  21. 21.116 + 77 =
  22. 22.376 + 89 =
  23. 23.362 + 58 =
  24. 24.253 + 98 =
  25. 25.392 + 19 =
  26. 26.111 + 69 =
  27. 27.285 + 18 =
  28. 28.270 + 97 =
  29. 29.161 + 57 =
  30. 30.433 + 87 =
  31. 31.285 + 68 =
  32. 32.229 + 47 =
  33. 33.250 + 87 =
  34. 34.227 + 88 =
  35. 35.58 + 59 =
  36. 36.150 + 47 =
  37. 37.360 + 87 =
  38. 38.209 + 79 =
  39. 39.474 + 99 =
  40. 40.491 + 29 =

Answer key

  1. 77
  2. 520
  3. 207
  4. 465
  5. 165
  6. 76
  7. 374
  8. 438
  9. 423
  10. 172
  11. 229
  12. 126
  13. 261
  14. 266
  15. 394
  16. 508
  17. 151
  18. 437
  19. 296
  20. 98
  21. 193
  22. 465
  23. 420
  24. 351
  25. 411
  26. 180
  27. 303
  28. 367
  29. 218
  30. 520
  31. 353
  32. 276
  33. 337
  34. 315
  35. 117
  36. 197
  37. 447
  38. 288
  39. 573
  40. 520

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