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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 449 · 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. 1.107 + 18 =
  2. 2.464 + 68 =
  3. 3.492 + 99 =
  4. 4.292 + 48 =
  5. 5.179 + 57 =
  6. 6.442 + 37 =
  7. 7.113 + 29 =
  8. 8.438 + 39 =
  9. 9.39 + 28 =
  10. 10.122 + 49 =
  11. 11.441 + 48 =
  12. 12.313 + 18 =
  13. 13.452 + 18 =
  14. 14.463 + 87 =
  15. 15.144 + 49 =
  16. 16.197 + 87 =
  17. 17.382 + 29 =
  18. 18.183 + 19 =
  19. 19.197 + 98 =
  20. 20.493 + 39 =
  21. 21.420 + 57 =
  22. 22.73 + 57 =
  23. 23.113 + 27 =
  24. 24.428 + 18 =
  25. 25.169 + 89 =
  26. 26.383 + 97 =
  27. 27.290 + 37 =
  28. 28.336 + 39 =
  29. 29.496 + 99 =
  30. 30.209 + 88 =
  31. 31.359 + 59 =
  32. 32.50 + 47 =
  33. 33.280 + 97 =
  34. 34.402 + 29 =
  35. 35.379 + 48 =
  36. 36.407 + 28 =
  37. 37.92 + 39 =
  38. 38.140 + 39 =
  39. 39.69 + 68 =
  40. 40.85 + 17 =

Answer key

  1. 125
  2. 532
  3. 591
  4. 340
  5. 236
  6. 479
  7. 142
  8. 477
  9. 67
  10. 171
  11. 489
  12. 331
  13. 470
  14. 550
  15. 193
  16. 284
  17. 411
  18. 202
  19. 295
  20. 532
  21. 477
  22. 130
  23. 140
  24. 446
  25. 258
  26. 480
  27. 327
  28. 375
  29. 595
  30. 297
  31. 418
  32. 97
  33. 377
  34. 431
  35. 427
  36. 435
  37. 131
  38. 179
  39. 137
  40. 102

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