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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 11 · 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. 1.79 + 19 =
  2. 2.264 + 89 =
  3. 3.426 + 77 =
  4. 4.367 + 27 =
  5. 5.374 + 68 =
  6. 6.459 + 88 =
  7. 7.313 + 67 =
  8. 8.296 + 99 =
  9. 9.426 + 68 =
  10. 10.328 + 59 =
  11. 11.91 + 27 =
  12. 12.214 + 29 =
  13. 13.460 + 57 =
  14. 14.93 + 98 =
  15. 15.141 + 89 =
  16. 16.303 + 89 =
  17. 17.170 + 29 =
  18. 18.158 + 59 =
  19. 19.366 + 28 =
  20. 20.159 + 58 =
  21. 21.259 + 57 =
  22. 22.430 + 28 =
  23. 23.462 + 58 =
  24. 24.179 + 48 =
  25. 25.353 + 68 =
  26. 26.109 + 87 =
  27. 27.84 + 79 =
  28. 28.375 + 78 =
  29. 29.194 + 99 =
  30. 30.48 + 69 =
  31. 31.87 + 39 =
  32. 32.179 + 78 =
  33. 33.70 + 57 =
  34. 34.349 + 27 =
  35. 35.156 + 99 =
  36. 36.51 + 48 =
  37. 37.219 + 37 =
  38. 38.113 + 98 =
  39. 39.174 + 78 =
  40. 40.134 + 37 =

Answer key

  1. 98
  2. 353
  3. 503
  4. 394
  5. 442
  6. 547
  7. 380
  8. 395
  9. 494
  10. 387
  11. 118
  12. 243
  13. 517
  14. 191
  15. 230
  16. 392
  17. 199
  18. 217
  19. 394
  20. 217
  21. 316
  22. 458
  23. 520
  24. 227
  25. 421
  26. 196
  27. 163
  28. 453
  29. 293
  30. 117
  31. 126
  32. 257
  33. 127
  34. 376
  35. 255
  36. 99
  37. 256
  38. 211
  39. 252
  40. 171

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