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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 467 · 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. 1.247 + 37 =
  2. 2.76 + 88 =
  3. 3.208 + 97 =
  4. 4.135 + 88 =
  5. 5.233 + 59 =
  6. 6.112 + 19 =
  7. 7.45 + 48 =
  8. 8.138 + 89 =
  9. 9.150 + 99 =
  10. 10.77 + 27 =
  11. 11.476 + 58 =
  12. 12.186 + 69 =
  13. 13.265 + 17 =
  14. 14.414 + 48 =
  15. 15.83 + 97 =
  16. 16.129 + 29 =
  17. 17.465 + 87 =
  18. 18.223 + 19 =
  19. 19.266 + 49 =
  20. 20.473 + 59 =
  21. 21.102 + 97 =
  22. 22.327 + 18 =
  23. 23.164 + 27 =
  24. 24.139 + 59 =
  25. 25.149 + 37 =
  26. 26.374 + 29 =
  27. 27.488 + 17 =
  28. 28.128 + 19 =
  29. 29.318 + 97 =
  30. 30.191 + 78 =
  31. 31.143 + 69 =
  32. 32.136 + 49 =
  33. 33.31 + 57 =
  34. 34.256 + 48 =
  35. 35.173 + 57 =
  36. 36.433 + 77 =
  37. 37.468 + 69 =
  38. 38.273 + 39 =
  39. 39.265 + 28 =
  40. 40.93 + 89 =

Answer key

  1. 284
  2. 164
  3. 305
  4. 223
  5. 292
  6. 131
  7. 93
  8. 227
  9. 249
  10. 104
  11. 534
  12. 255
  13. 282
  14. 462
  15. 180
  16. 158
  17. 552
  18. 242
  19. 315
  20. 532
  21. 199
  22. 345
  23. 191
  24. 198
  25. 186
  26. 403
  27. 505
  28. 147
  29. 415
  30. 269
  31. 212
  32. 185
  33. 88
  34. 304
  35. 230
  36. 510
  37. 537
  38. 312
  39. 293
  40. 182

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