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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 2 · 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. 1.208 + 97 =
  2. 2.461 + 68 =
  3. 3.307 + 57 =
  4. 4.51 + 18 =
  5. 5.390 + 88 =
  6. 6.164 + 67 =
  7. 7.114 + 67 =
  8. 8.146 + 48 =
  9. 9.304 + 17 =
  10. 10.481 + 97 =
  11. 11.142 + 87 =
  12. 12.60 + 48 =
  13. 13.50 + 89 =
  14. 14.447 + 37 =
  15. 15.162 + 18 =
  16. 16.31 + 78 =
  17. 17.264 + 37 =
  18. 18.139 + 39 =
  19. 19.137 + 37 =
  20. 20.403 + 19 =
  21. 21.127 + 87 =
  22. 22.240 + 48 =
  23. 23.223 + 88 =
  24. 24.458 + 59 =
  25. 25.145 + 77 =
  26. 26.154 + 47 =
  27. 27.468 + 37 =
  28. 28.303 + 19 =
  29. 29.367 + 88 =
  30. 30.36 + 18 =
  31. 31.75 + 69 =
  32. 32.46 + 49 =
  33. 33.210 + 47 =
  34. 34.361 + 17 =
  35. 35.95 + 57 =
  36. 36.474 + 38 =
  37. 37.446 + 39 =
  38. 38.490 + 28 =
  39. 39.276 + 29 =
  40. 40.27 + 49 =

Answer key

  1. 305
  2. 529
  3. 364
  4. 69
  5. 478
  6. 231
  7. 181
  8. 194
  9. 321
  10. 578
  11. 229
  12. 108
  13. 139
  14. 484
  15. 180
  16. 109
  17. 301
  18. 178
  19. 174
  20. 422
  21. 214
  22. 288
  23. 311
  24. 517
  25. 222
  26. 201
  27. 505
  28. 322
  29. 455
  30. 54
  31. 144
  32. 95
  33. 257
  34. 378
  35. 152
  36. 512
  37. 485
  38. 518
  39. 305
  40. 76

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