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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 26 · 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. 1.469 + 97 =
  2. 2.228 + 87 =
  3. 3.133 + 97 =
  4. 4.477 + 88 =
  5. 5.171 + 89 =
  6. 6.498 + 57 =
  7. 7.495 + 18 =
  8. 8.253 + 68 =
  9. 9.65 + 68 =
  10. 10.91 + 17 =
  11. 11.387 + 57 =
  12. 12.226 + 37 =
  13. 13.34 + 97 =
  14. 14.317 + 28 =
  15. 15.483 + 98 =
  16. 16.271 + 98 =
  17. 17.412 + 48 =
  18. 18.334 + 59 =
  19. 19.84 + 88 =
  20. 20.446 + 87 =
  21. 21.196 + 27 =
  22. 22.268 + 19 =
  23. 23.143 + 97 =
  24. 24.243 + 48 =
  25. 25.252 + 28 =
  26. 26.252 + 17 =
  27. 27.480 + 88 =
  28. 28.495 + 27 =
  29. 29.477 + 39 =
  30. 30.423 + 19 =
  31. 31.236 + 27 =
  32. 32.244 + 49 =
  33. 33.399 + 99 =
  34. 34.327 + 89 =
  35. 35.484 + 87 =
  36. 36.52 + 38 =
  37. 37.273 + 28 =
  38. 38.239 + 58 =
  39. 39.399 + 58 =
  40. 40.41 + 49 =

Answer key

  1. 566
  2. 315
  3. 230
  4. 565
  5. 260
  6. 555
  7. 513
  8. 321
  9. 133
  10. 108
  11. 444
  12. 263
  13. 131
  14. 345
  15. 581
  16. 369
  17. 460
  18. 393
  19. 172
  20. 533
  21. 223
  22. 287
  23. 240
  24. 291
  25. 280
  26. 269
  27. 568
  28. 522
  29. 516
  30. 442
  31. 263
  32. 293
  33. 498
  34. 416
  35. 571
  36. 90
  37. 301
  38. 297
  39. 457
  40. 90

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