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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 835 · 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. 1.199 + 79 =
  2. 2.127 + 89 =
  3. 3.65 + 38 =
  4. 4.184 + 67 =
  5. 5.447 + 87 =
  6. 6.371 + 59 =
  7. 7.451 + 97 =
  8. 8.331 + 38 =
  9. 9.465 + 49 =
  10. 10.234 + 77 =
  11. 11.209 + 48 =
  12. 12.435 + 47 =
  13. 13.145 + 98 =
  14. 14.87 + 68 =
  15. 15.292 + 68 =
  16. 16.243 + 49 =
  17. 17.154 + 49 =
  18. 18.277 + 47 =
  19. 19.252 + 47 =
  20. 20.227 + 38 =
  21. 21.329 + 27 =
  22. 22.202 + 77 =
  23. 23.214 + 68 =
  24. 24.118 + 37 =
  25. 25.90 + 58 =
  26. 26.374 + 28 =
  27. 27.198 + 19 =
  28. 28.188 + 87 =
  29. 29.32 + 19 =
  30. 30.498 + 38 =
  31. 31.354 + 88 =
  32. 32.84 + 37 =
  33. 33.449 + 89 =
  34. 34.428 + 19 =
  35. 35.374 + 49 =
  36. 36.291 + 47 =
  37. 37.355 + 58 =
  38. 38.224 + 88 =
  39. 39.293 + 27 =
  40. 40.200 + 57 =

Answer key

  1. 278
  2. 216
  3. 103
  4. 251
  5. 534
  6. 430
  7. 548
  8. 369
  9. 514
  10. 311
  11. 257
  12. 482
  13. 243
  14. 155
  15. 360
  16. 292
  17. 203
  18. 324
  19. 299
  20. 265
  21. 356
  22. 279
  23. 282
  24. 155
  25. 148
  26. 402
  27. 217
  28. 275
  29. 51
  30. 536
  31. 442
  32. 121
  33. 538
  34. 447
  35. 423
  36. 338
  37. 413
  38. 312
  39. 320
  40. 257

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