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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 149 · 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. 1.202 + 97 =
  2. 2.490 + 19 =
  3. 3.162 + 19 =
  4. 4.265 + 87 =
  5. 5.377 + 78 =
  6. 6.105 + 87 =
  7. 7.107 + 79 =
  8. 8.138 + 58 =
  9. 9.424 + 68 =
  10. 10.198 + 49 =
  11. 11.35 + 67 =
  12. 12.231 + 49 =
  13. 13.131 + 89 =
  14. 14.230 + 47 =
  15. 15.166 + 19 =
  16. 16.100 + 38 =
  17. 17.106 + 48 =
  18. 18.491 + 57 =
  19. 19.246 + 88 =
  20. 20.119 + 17 =
  21. 21.227 + 47 =
  22. 22.34 + 19 =
  23. 23.309 + 19 =
  24. 24.446 + 58 =
  25. 25.239 + 29 =
  26. 26.334 + 88 =
  27. 27.234 + 27 =
  28. 28.78 + 87 =
  29. 29.264 + 47 =
  30. 30.218 + 49 =
  31. 31.92 + 18 =
  32. 32.230 + 98 =
  33. 33.483 + 37 =
  34. 34.454 + 79 =
  35. 35.209 + 97 =
  36. 36.301 + 17 =
  37. 37.116 + 87 =
  38. 38.229 + 98 =
  39. 39.199 + 78 =
  40. 40.146 + 27 =

Answer key

  1. 299
  2. 509
  3. 181
  4. 352
  5. 455
  6. 192
  7. 186
  8. 196
  9. 492
  10. 247
  11. 102
  12. 280
  13. 220
  14. 277
  15. 185
  16. 138
  17. 154
  18. 548
  19. 334
  20. 136
  21. 274
  22. 53
  23. 328
  24. 504
  25. 268
  26. 422
  27. 261
  28. 165
  29. 311
  30. 267
  31. 110
  32. 328
  33. 520
  34. 533
  35. 306
  36. 318
  37. 203
  38. 327
  39. 277
  40. 173

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