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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 692 · 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. 1.449 + 98 =
  2. 2.381 + 48 =
  3. 3.368 + 98 =
  4. 4.330 + 89 =
  5. 5.129 + 28 =
  6. 6.316 + 89 =
  7. 7.59 + 88 =
  8. 8.253 + 68 =
  9. 9.100 + 37 =
  10. 10.57 + 79 =
  11. 11.87 + 89 =
  12. 12.155 + 98 =
  13. 13.266 + 17 =
  14. 14.327 + 37 =
  15. 15.408 + 49 =
  16. 16.228 + 68 =
  17. 17.144 + 77 =
  18. 18.247 + 19 =
  19. 19.423 + 58 =
  20. 20.223 + 17 =
  21. 21.410 + 37 =
  22. 22.69 + 79 =
  23. 23.350 + 87 =
  24. 24.321 + 57 =
  25. 25.371 + 99 =
  26. 26.34 + 98 =
  27. 27.212 + 87 =
  28. 28.63 + 18 =
  29. 29.269 + 68 =
  30. 30.250 + 78 =
  31. 31.111 + 49 =
  32. 32.347 + 99 =
  33. 33.104 + 28 =
  34. 34.71 + 27 =
  35. 35.469 + 37 =
  36. 36.88 + 97 =
  37. 37.122 + 88 =
  38. 38.213 + 58 =
  39. 39.364 + 57 =
  40. 40.51 + 78 =

Answer key

  1. 547
  2. 429
  3. 466
  4. 419
  5. 157
  6. 405
  7. 147
  8. 321
  9. 137
  10. 136
  11. 176
  12. 253
  13. 283
  14. 364
  15. 457
  16. 296
  17. 221
  18. 266
  19. 481
  20. 240
  21. 447
  22. 148
  23. 437
  24. 378
  25. 470
  26. 132
  27. 299
  28. 81
  29. 337
  30. 328
  31. 160
  32. 446
  33. 132
  34. 98
  35. 506
  36. 185
  37. 210
  38. 271
  39. 421
  40. 129

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