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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 549 · 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. 1.380 + 89 =
  2. 2.243 + 69 =
  3. 3.209 + 19 =
  4. 4.213 + 39 =
  5. 5.82 + 27 =
  6. 6.82 + 67 =
  7. 7.366 + 77 =
  8. 8.36 + 99 =
  9. 9.397 + 28 =
  10. 10.158 + 17 =
  11. 11.393 + 19 =
  12. 12.170 + 19 =
  13. 13.161 + 99 =
  14. 14.474 + 47 =
  15. 15.364 + 99 =
  16. 16.304 + 77 =
  17. 17.56 + 47 =
  18. 18.165 + 79 =
  19. 19.487 + 69 =
  20. 20.193 + 19 =
  21. 21.398 + 77 =
  22. 22.494 + 68 =
  23. 23.358 + 29 =
  24. 24.156 + 28 =
  25. 25.114 + 57 =
  26. 26.499 + 98 =
  27. 27.256 + 48 =
  28. 28.57 + 27 =
  29. 29.266 + 19 =
  30. 30.106 + 29 =
  31. 31.259 + 58 =
  32. 32.400 + 88 =
  33. 33.240 + 29 =
  34. 34.278 + 78 =
  35. 35.345 + 79 =
  36. 36.194 + 27 =
  37. 37.140 + 37 =
  38. 38.289 + 27 =
  39. 39.356 + 17 =
  40. 40.100 + 37 =

Answer key

  1. 469
  2. 312
  3. 228
  4. 252
  5. 109
  6. 149
  7. 443
  8. 135
  9. 425
  10. 175
  11. 412
  12. 189
  13. 260
  14. 521
  15. 463
  16. 381
  17. 103
  18. 244
  19. 556
  20. 212
  21. 475
  22. 562
  23. 387
  24. 184
  25. 171
  26. 597
  27. 304
  28. 84
  29. 285
  30. 135
  31. 317
  32. 488
  33. 269
  34. 356
  35. 424
  36. 221
  37. 177
  38. 316
  39. 373
  40. 137

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