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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 630 · 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. 1.182 + 67 =
  2. 2.428 + 88 =
  3. 3.134 + 89 =
  4. 4.392 + 38 =
  5. 5.315 + 98 =
  6. 6.25 + 78 =
  7. 7.390 + 78 =
  8. 8.404 + 29 =
  9. 9.251 + 78 =
  10. 10.277 + 58 =
  11. 11.81 + 29 =
  12. 12.155 + 47 =
  13. 13.435 + 49 =
  14. 14.240 + 58 =
  15. 15.238 + 99 =
  16. 16.189 + 48 =
  17. 17.106 + 47 =
  18. 18.467 + 39 =
  19. 19.134 + 67 =
  20. 20.260 + 57 =
  21. 21.132 + 69 =
  22. 22.350 + 87 =
  23. 23.102 + 17 =
  24. 24.486 + 79 =
  25. 25.257 + 38 =
  26. 26.162 + 59 =
  27. 27.302 + 87 =
  28. 28.146 + 99 =
  29. 29.125 + 29 =
  30. 30.419 + 97 =
  31. 31.443 + 48 =
  32. 32.75 + 39 =
  33. 33.29 + 88 =
  34. 34.295 + 67 =
  35. 35.57 + 68 =
  36. 36.92 + 79 =
  37. 37.135 + 57 =
  38. 38.110 + 57 =
  39. 39.280 + 87 =
  40. 40.158 + 87 =

Answer key

  1. 249
  2. 516
  3. 223
  4. 430
  5. 413
  6. 103
  7. 468
  8. 433
  9. 329
  10. 335
  11. 110
  12. 202
  13. 484
  14. 298
  15. 337
  16. 237
  17. 153
  18. 506
  19. 201
  20. 317
  21. 201
  22. 437
  23. 119
  24. 565
  25. 295
  26. 221
  27. 389
  28. 245
  29. 154
  30. 516
  31. 491
  32. 114
  33. 117
  34. 362
  35. 125
  36. 171
  37. 192
  38. 167
  39. 367
  40. 245

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