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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 500 · 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. 1.381 + 97 =
  2. 2.112 + 39 =
  3. 3.45 + 49 =
  4. 4.117 + 57 =
  5. 5.305 + 97 =
  6. 6.293 + 78 =
  7. 7.171 + 37 =
  8. 8.81 + 67 =
  9. 9.232 + 47 =
  10. 10.436 + 18 =
  11. 11.129 + 87 =
  12. 12.182 + 39 =
  13. 13.326 + 98 =
  14. 14.94 + 88 =
  15. 15.390 + 29 =
  16. 16.46 + 18 =
  17. 17.265 + 89 =
  18. 18.27 + 99 =
  19. 19.89 + 19 =
  20. 20.174 + 79 =
  21. 21.302 + 29 =
  22. 22.252 + 88 =
  23. 23.165 + 39 =
  24. 24.85 + 29 =
  25. 25.71 + 59 =
  26. 26.114 + 78 =
  27. 27.190 + 37 =
  28. 28.125 + 78 =
  29. 29.84 + 77 =
  30. 30.328 + 37 =
  31. 31.55 + 19 =
  32. 32.327 + 88 =
  33. 33.208 + 57 =
  34. 34.88 + 18 =
  35. 35.227 + 97 =
  36. 36.244 + 88 =
  37. 37.278 + 39 =
  38. 38.323 + 59 =
  39. 39.224 + 18 =
  40. 40.259 + 78 =

Answer key

  1. 478
  2. 151
  3. 94
  4. 174
  5. 402
  6. 371
  7. 208
  8. 148
  9. 279
  10. 454
  11. 216
  12. 221
  13. 424
  14. 182
  15. 419
  16. 64
  17. 354
  18. 126
  19. 108
  20. 253
  21. 331
  22. 340
  23. 204
  24. 114
  25. 130
  26. 192
  27. 227
  28. 203
  29. 161
  30. 365
  31. 74
  32. 415
  33. 265
  34. 106
  35. 324
  36. 332
  37. 317
  38. 382
  39. 242
  40. 337

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