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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 807 · 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. 1.356 + 17 =
  2. 2.381 + 87 =
  3. 3.113 + 37 =
  4. 4.236 + 49 =
  5. 5.60 + 99 =
  6. 6.471 + 18 =
  7. 7.137 + 27 =
  8. 8.420 + 28 =
  9. 9.43 + 79 =
  10. 10.472 + 88 =
  11. 11.452 + 69 =
  12. 12.90 + 38 =
  13. 13.362 + 48 =
  14. 14.481 + 58 =
  15. 15.293 + 37 =
  16. 16.96 + 98 =
  17. 17.316 + 68 =
  18. 18.121 + 49 =
  19. 19.302 + 48 =
  20. 20.67 + 17 =
  21. 21.412 + 78 =
  22. 22.217 + 19 =
  23. 23.92 + 69 =
  24. 24.220 + 99 =
  25. 25.228 + 98 =
  26. 26.191 + 79 =
  27. 27.292 + 48 =
  28. 28.142 + 59 =
  29. 29.75 + 28 =
  30. 30.165 + 58 =
  31. 31.142 + 28 =
  32. 32.290 + 18 =
  33. 33.413 + 69 =
  34. 34.213 + 39 =
  35. 35.159 + 77 =
  36. 36.272 + 48 =
  37. 37.118 + 57 =
  38. 38.397 + 79 =
  39. 39.177 + 58 =
  40. 40.324 + 27 =

Answer key

  1. 373
  2. 468
  3. 150
  4. 285
  5. 159
  6. 489
  7. 164
  8. 448
  9. 122
  10. 560
  11. 521
  12. 128
  13. 410
  14. 539
  15. 330
  16. 194
  17. 384
  18. 170
  19. 350
  20. 84
  21. 490
  22. 236
  23. 161
  24. 319
  25. 326
  26. 270
  27. 340
  28. 201
  29. 103
  30. 223
  31. 170
  32. 308
  33. 482
  34. 252
  35. 236
  36. 320
  37. 175
  38. 476
  39. 235
  40. 351

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