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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 861 · 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. 1.90 + 68 =
  2. 2.372 + 88 =
  3. 3.463 + 57 =
  4. 4.159 + 69 =
  5. 5.167 + 29 =
  6. 6.341 + 99 =
  7. 7.381 + 49 =
  8. 8.339 + 48 =
  9. 9.135 + 58 =
  10. 10.242 + 58 =
  11. 11.423 + 97 =
  12. 12.74 + 78 =
  13. 13.277 + 28 =
  14. 14.384 + 57 =
  15. 15.83 + 29 =
  16. 16.397 + 28 =
  17. 17.469 + 97 =
  18. 18.107 + 49 =
  19. 19.237 + 18 =
  20. 20.383 + 69 =
  21. 21.344 + 88 =
  22. 22.141 + 27 =
  23. 23.367 + 47 =
  24. 24.278 + 39 =
  25. 25.143 + 68 =
  26. 26.270 + 18 =
  27. 27.198 + 67 =
  28. 28.371 + 88 =
  29. 29.127 + 78 =
  30. 30.96 + 68 =
  31. 31.450 + 78 =
  32. 32.228 + 67 =
  33. 33.329 + 67 =
  34. 34.52 + 19 =
  35. 35.335 + 18 =
  36. 36.459 + 29 =
  37. 37.258 + 38 =
  38. 38.276 + 87 =
  39. 39.452 + 67 =
  40. 40.245 + 69 =

Answer key

  1. 158
  2. 460
  3. 520
  4. 228
  5. 196
  6. 440
  7. 430
  8. 387
  9. 193
  10. 300
  11. 520
  12. 152
  13. 305
  14. 441
  15. 112
  16. 425
  17. 566
  18. 156
  19. 255
  20. 452
  21. 432
  22. 168
  23. 414
  24. 317
  25. 211
  26. 288
  27. 265
  28. 459
  29. 205
  30. 164
  31. 528
  32. 295
  33. 396
  34. 71
  35. 353
  36. 488
  37. 296
  38. 363
  39. 519
  40. 314

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