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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 927 · 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. 1.244 + 47 =
  2. 2.115 + 18 =
  3. 3.418 + 19 =
  4. 4.54 + 77 =
  5. 5.142 + 48 =
  6. 6.171 + 79 =
  7. 7.395 + 78 =
  8. 8.98 + 48 =
  9. 9.51 + 38 =
  10. 10.468 + 17 =
  11. 11.472 + 38 =
  12. 12.243 + 58 =
  13. 13.480 + 37 =
  14. 14.384 + 19 =
  15. 15.95 + 38 =
  16. 16.344 + 29 =
  17. 17.186 + 98 =
  18. 18.450 + 38 =
  19. 19.242 + 78 =
  20. 20.429 + 77 =
  21. 21.158 + 38 =
  22. 22.120 + 98 =
  23. 23.428 + 17 =
  24. 24.110 + 58 =
  25. 25.417 + 29 =
  26. 26.241 + 27 =
  27. 27.104 + 19 =
  28. 28.468 + 59 =
  29. 29.53 + 59 =
  30. 30.379 + 77 =
  31. 31.162 + 88 =
  32. 32.106 + 48 =
  33. 33.462 + 38 =
  34. 34.330 + 17 =
  35. 35.362 + 38 =
  36. 36.132 + 18 =
  37. 37.95 + 37 =
  38. 38.247 + 78 =
  39. 39.208 + 17 =
  40. 40.175 + 49 =

Answer key

  1. 291
  2. 133
  3. 437
  4. 131
  5. 190
  6. 250
  7. 473
  8. 146
  9. 89
  10. 485
  11. 510
  12. 301
  13. 517
  14. 403
  15. 133
  16. 373
  17. 284
  18. 488
  19. 320
  20. 506
  21. 196
  22. 218
  23. 445
  24. 168
  25. 446
  26. 268
  27. 123
  28. 527
  29. 112
  30. 456
  31. 250
  32. 154
  33. 500
  34. 347
  35. 400
  36. 150
  37. 132
  38. 325
  39. 225
  40. 224

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