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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 110 · 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. 1.228 + 67 =
  2. 2.419 + 49 =
  3. 3.433 + 98 =
  4. 4.384 + 58 =
  5. 5.322 + 79 =
  6. 6.248 + 87 =
  7. 7.154 + 97 =
  8. 8.252 + 38 =
  9. 9.287 + 27 =
  10. 10.87 + 27 =
  11. 11.111 + 29 =
  12. 12.339 + 97 =
  13. 13.180 + 39 =
  14. 14.479 + 17 =
  15. 15.152 + 37 =
  16. 16.113 + 18 =
  17. 17.268 + 19 =
  18. 18.147 + 28 =
  19. 19.83 + 37 =
  20. 20.132 + 39 =
  21. 21.246 + 48 =
  22. 22.126 + 99 =
  23. 23.96 + 37 =
  24. 24.132 + 78 =
  25. 25.495 + 59 =
  26. 26.148 + 39 =
  27. 27.105 + 78 =
  28. 28.29 + 78 =
  29. 29.90 + 17 =
  30. 30.415 + 37 =
  31. 31.28 + 17 =
  32. 32.113 + 48 =
  33. 33.47 + 19 =
  34. 34.498 + 18 =
  35. 35.185 + 89 =
  36. 36.209 + 69 =
  37. 37.493 + 67 =
  38. 38.209 + 89 =
  39. 39.41 + 67 =
  40. 40.367 + 18 =

Answer key

  1. 295
  2. 468
  3. 531
  4. 442
  5. 401
  6. 335
  7. 251
  8. 290
  9. 314
  10. 114
  11. 140
  12. 436
  13. 219
  14. 496
  15. 189
  16. 131
  17. 287
  18. 175
  19. 120
  20. 171
  21. 294
  22. 225
  23. 133
  24. 210
  25. 554
  26. 187
  27. 183
  28. 107
  29. 107
  30. 452
  31. 45
  32. 161
  33. 66
  34. 516
  35. 274
  36. 278
  37. 560
  38. 298
  39. 108
  40. 385

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