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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 543 · 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. 1.145 + 58 =
  2. 2.367 + 38 =
  3. 3.449 + 47 =
  4. 4.342 + 89 =
  5. 5.146 + 17 =
  6. 6.78 + 88 =
  7. 7.292 + 28 =
  8. 8.448 + 69 =
  9. 9.194 + 67 =
  10. 10.373 + 79 =
  11. 11.257 + 57 =
  12. 12.41 + 87 =
  13. 13.144 + 27 =
  14. 14.332 + 67 =
  15. 15.304 + 78 =
  16. 16.479 + 77 =
  17. 17.191 + 58 =
  18. 18.28 + 19 =
  19. 19.399 + 17 =
  20. 20.74 + 99 =
  21. 21.385 + 17 =
  22. 22.358 + 19 =
  23. 23.262 + 77 =
  24. 24.390 + 27 =
  25. 25.223 + 38 =
  26. 26.191 + 38 =
  27. 27.73 + 97 =
  28. 28.319 + 58 =
  29. 29.474 + 37 =
  30. 30.241 + 39 =
  31. 31.156 + 37 =
  32. 32.386 + 48 =
  33. 33.50 + 57 =
  34. 34.249 + 59 =
  35. 35.361 + 69 =
  36. 36.313 + 77 =
  37. 37.353 + 78 =
  38. 38.142 + 37 =
  39. 39.317 + 47 =
  40. 40.394 + 87 =

Answer key

  1. 203
  2. 405
  3. 496
  4. 431
  5. 163
  6. 166
  7. 320
  8. 517
  9. 261
  10. 452
  11. 314
  12. 128
  13. 171
  14. 399
  15. 382
  16. 556
  17. 249
  18. 47
  19. 416
  20. 173
  21. 402
  22. 377
  23. 339
  24. 417
  25. 261
  26. 229
  27. 170
  28. 377
  29. 511
  30. 280
  31. 193
  32. 434
  33. 107
  34. 308
  35. 430
  36. 390
  37. 431
  38. 179
  39. 364
  40. 481

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