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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 583 · 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. 1.173 + 17 =
  2. 2.112 + 39 =
  3. 3.386 + 28 =
  4. 4.439 + 18 =
  5. 5.165 + 87 =
  6. 6.244 + 88 =
  7. 7.139 + 39 =
  8. 8.394 + 19 =
  9. 9.265 + 87 =
  10. 10.113 + 17 =
  11. 11.457 + 17 =
  12. 12.494 + 19 =
  13. 13.53 + 77 =
  14. 14.151 + 17 =
  15. 15.147 + 77 =
  16. 16.136 + 67 =
  17. 17.117 + 59 =
  18. 18.321 + 69 =
  19. 19.331 + 78 =
  20. 20.75 + 37 =
  21. 21.288 + 27 =
  22. 22.132 + 59 =
  23. 23.27 + 18 =
  24. 24.420 + 28 =
  25. 25.366 + 99 =
  26. 26.349 + 37 =
  27. 27.380 + 87 =
  28. 28.147 + 89 =
  29. 29.464 + 37 =
  30. 30.186 + 57 =
  31. 31.70 + 88 =
  32. 32.288 + 38 =
  33. 33.44 + 89 =
  34. 34.348 + 38 =
  35. 35.181 + 39 =
  36. 36.179 + 48 =
  37. 37.197 + 77 =
  38. 38.32 + 77 =
  39. 39.427 + 39 =
  40. 40.397 + 17 =

Answer key

  1. 190
  2. 151
  3. 414
  4. 457
  5. 252
  6. 332
  7. 178
  8. 413
  9. 352
  10. 130
  11. 474
  12. 513
  13. 130
  14. 168
  15. 224
  16. 203
  17. 176
  18. 390
  19. 409
  20. 112
  21. 315
  22. 191
  23. 45
  24. 448
  25. 465
  26. 386
  27. 467
  28. 236
  29. 501
  30. 243
  31. 158
  32. 326
  33. 133
  34. 386
  35. 220
  36. 227
  37. 274
  38. 109
  39. 466
  40. 414

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