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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 696 · 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. 1.67 + 19 =
  2. 2.62 + 98 =
  3. 3.304 + 29 =
  4. 4.110 + 89 =
  5. 5.249 + 38 =
  6. 6.149 + 97 =
  7. 7.308 + 57 =
  8. 8.284 + 67 =
  9. 9.475 + 49 =
  10. 10.451 + 19 =
  11. 11.196 + 97 =
  12. 12.370 + 27 =
  13. 13.249 + 99 =
  14. 14.283 + 27 =
  15. 15.75 + 57 =
  16. 16.162 + 87 =
  17. 17.479 + 18 =
  18. 18.72 + 99 =
  19. 19.56 + 99 =
  20. 20.134 + 58 =
  21. 21.369 + 48 =
  22. 22.61 + 69 =
  23. 23.168 + 29 =
  24. 24.290 + 49 =
  25. 25.256 + 27 =
  26. 26.140 + 19 =
  27. 27.165 + 37 =
  28. 28.286 + 28 =
  29. 29.189 + 77 =
  30. 30.328 + 89 =
  31. 31.162 + 88 =
  32. 32.275 + 27 =
  33. 33.134 + 18 =
  34. 34.60 + 29 =
  35. 35.48 + 29 =
  36. 36.299 + 28 =
  37. 37.182 + 49 =
  38. 38.51 + 48 =
  39. 39.110 + 38 =
  40. 40.159 + 89 =

Answer key

  1. 86
  2. 160
  3. 333
  4. 199
  5. 287
  6. 246
  7. 365
  8. 351
  9. 524
  10. 470
  11. 293
  12. 397
  13. 348
  14. 310
  15. 132
  16. 249
  17. 497
  18. 171
  19. 155
  20. 192
  21. 417
  22. 130
  23. 197
  24. 339
  25. 283
  26. 159
  27. 202
  28. 314
  29. 266
  30. 417
  31. 250
  32. 302
  33. 152
  34. 89
  35. 77
  36. 327
  37. 231
  38. 99
  39. 148
  40. 248

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