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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 848 · 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. 1.54 + 67 =
  2. 2.221 + 39 =
  3. 3.478 + 29 =
  4. 4.450 + 77 =
  5. 5.251 + 27 =
  6. 6.484 + 78 =
  7. 7.158 + 79 =
  8. 8.170 + 39 =
  9. 9.138 + 57 =
  10. 10.68 + 57 =
  11. 11.342 + 37 =
  12. 12.89 + 89 =
  13. 13.322 + 87 =
  14. 14.199 + 89 =
  15. 15.86 + 79 =
  16. 16.114 + 59 =
  17. 17.362 + 48 =
  18. 18.206 + 78 =
  19. 19.262 + 69 =
  20. 20.130 + 38 =
  21. 21.357 + 58 =
  22. 22.331 + 18 =
  23. 23.312 + 19 =
  24. 24.491 + 89 =
  25. 25.342 + 29 =
  26. 26.125 + 17 =
  27. 27.411 + 28 =
  28. 28.351 + 37 =
  29. 29.258 + 29 =
  30. 30.126 + 29 =
  31. 31.376 + 27 =
  32. 32.61 + 67 =
  33. 33.47 + 88 =
  34. 34.343 + 38 =
  35. 35.210 + 98 =
  36. 36.155 + 29 =
  37. 37.333 + 79 =
  38. 38.107 + 19 =
  39. 39.348 + 17 =
  40. 40.305 + 19 =

Answer key

  1. 121
  2. 260
  3. 507
  4. 527
  5. 278
  6. 562
  7. 237
  8. 209
  9. 195
  10. 125
  11. 379
  12. 178
  13. 409
  14. 288
  15. 165
  16. 173
  17. 410
  18. 284
  19. 331
  20. 168
  21. 415
  22. 349
  23. 331
  24. 580
  25. 371
  26. 142
  27. 439
  28. 388
  29. 287
  30. 155
  31. 403
  32. 128
  33. 135
  34. 381
  35. 308
  36. 184
  37. 412
  38. 126
  39. 365
  40. 324

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