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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 717 · 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. 1.209 + 97 =
  2. 2.402 + 67 =
  3. 3.287 + 19 =
  4. 4.151 + 99 =
  5. 5.266 + 67 =
  6. 6.257 + 87 =
  7. 7.68 + 17 =
  8. 8.409 + 58 =
  9. 9.458 + 97 =
  10. 10.348 + 89 =
  11. 11.387 + 19 =
  12. 12.366 + 18 =
  13. 13.427 + 18 =
  14. 14.246 + 68 =
  15. 15.96 + 59 =
  16. 16.225 + 67 =
  17. 17.411 + 19 =
  18. 18.152 + 88 =
  19. 19.279 + 77 =
  20. 20.469 + 97 =
  21. 21.261 + 49 =
  22. 22.257 + 29 =
  23. 23.157 + 38 =
  24. 24.383 + 17 =
  25. 25.353 + 59 =
  26. 26.179 + 27 =
  27. 27.390 + 87 =
  28. 28.35 + 19 =
  29. 29.87 + 49 =
  30. 30.271 + 28 =
  31. 31.489 + 59 =
  32. 32.106 + 28 =
  33. 33.467 + 77 =
  34. 34.214 + 98 =
  35. 35.201 + 99 =
  36. 36.458 + 29 =
  37. 37.209 + 27 =
  38. 38.80 + 28 =
  39. 39.335 + 19 =
  40. 40.169 + 17 =

Answer key

  1. 306
  2. 469
  3. 306
  4. 250
  5. 333
  6. 344
  7. 85
  8. 467
  9. 555
  10. 437
  11. 406
  12. 384
  13. 445
  14. 314
  15. 155
  16. 292
  17. 430
  18. 240
  19. 356
  20. 566
  21. 310
  22. 286
  23. 195
  24. 400
  25. 412
  26. 206
  27. 477
  28. 54
  29. 136
  30. 299
  31. 548
  32. 134
  33. 544
  34. 312
  35. 300
  36. 487
  37. 236
  38. 108
  39. 354
  40. 186

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