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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 341 · 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. 1.472 + 88 =
  2. 2.387 + 68 =
  3. 3.370 + 89 =
  4. 4.109 + 28 =
  5. 5.49 + 97 =
  6. 6.228 + 59 =
  7. 7.216 + 27 =
  8. 8.154 + 67 =
  9. 9.244 + 19 =
  10. 10.73 + 58 =
  11. 11.351 + 27 =
  12. 12.359 + 19 =
  13. 13.79 + 39 =
  14. 14.493 + 17 =
  15. 15.164 + 28 =
  16. 16.402 + 49 =
  17. 17.144 + 89 =
  18. 18.358 + 67 =
  19. 19.495 + 58 =
  20. 20.383 + 27 =
  21. 21.101 + 37 =
  22. 22.148 + 38 =
  23. 23.81 + 19 =
  24. 24.80 + 19 =
  25. 25.42 + 89 =
  26. 26.224 + 28 =
  27. 27.310 + 79 =
  28. 28.228 + 59 =
  29. 29.431 + 67 =
  30. 30.101 + 68 =
  31. 31.143 + 89 =
  32. 32.428 + 79 =
  33. 33.321 + 19 =
  34. 34.315 + 19 =
  35. 35.173 + 79 =
  36. 36.121 + 97 =
  37. 37.28 + 88 =
  38. 38.35 + 28 =
  39. 39.25 + 19 =
  40. 40.164 + 37 =

Answer key

  1. 560
  2. 455
  3. 459
  4. 137
  5. 146
  6. 287
  7. 243
  8. 221
  9. 263
  10. 131
  11. 378
  12. 378
  13. 118
  14. 510
  15. 192
  16. 451
  17. 233
  18. 425
  19. 553
  20. 410
  21. 138
  22. 186
  23. 100
  24. 99
  25. 131
  26. 252
  27. 389
  28. 287
  29. 498
  30. 169
  31. 232
  32. 507
  33. 340
  34. 334
  35. 252
  36. 218
  37. 116
  38. 63
  39. 44
  40. 201

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