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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 748 · 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. 1.184 + 58 =
  2. 2.209 + 37 =
  3. 3.247 + 88 =
  4. 4.204 + 39 =
  5. 5.480 + 87 =
  6. 6.268 + 68 =
  7. 7.85 + 99 =
  8. 8.497 + 89 =
  9. 9.272 + 18 =
  10. 10.145 + 27 =
  11. 11.154 + 27 =
  12. 12.497 + 28 =
  13. 13.427 + 57 =
  14. 14.448 + 38 =
  15. 15.441 + 59 =
  16. 16.241 + 19 =
  17. 17.231 + 27 =
  18. 18.40 + 68 =
  19. 19.181 + 78 =
  20. 20.198 + 78 =
  21. 21.204 + 69 =
  22. 22.348 + 79 =
  23. 23.187 + 78 =
  24. 24.316 + 99 =
  25. 25.248 + 37 =
  26. 26.381 + 98 =
  27. 27.89 + 29 =
  28. 28.98 + 48 =
  29. 29.356 + 68 =
  30. 30.89 + 89 =
  31. 31.52 + 88 =
  32. 32.415 + 19 =
  33. 33.265 + 28 =
  34. 34.79 + 19 =
  35. 35.244 + 57 =
  36. 36.183 + 19 =
  37. 37.153 + 88 =
  38. 38.281 + 78 =
  39. 39.112 + 37 =
  40. 40.71 + 28 =

Answer key

  1. 242
  2. 246
  3. 335
  4. 243
  5. 567
  6. 336
  7. 184
  8. 586
  9. 290
  10. 172
  11. 181
  12. 525
  13. 484
  14. 486
  15. 500
  16. 260
  17. 258
  18. 108
  19. 259
  20. 276
  21. 273
  22. 427
  23. 265
  24. 415
  25. 285
  26. 479
  27. 118
  28. 146
  29. 424
  30. 178
  31. 140
  32. 434
  33. 293
  34. 98
  35. 301
  36. 202
  37. 241
  38. 359
  39. 149
  40. 99

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