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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 926 · 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. 1.171 + 67 =
  2. 2.483 + 28 =
  3. 3.457 + 48 =
  4. 4.458 + 59 =
  5. 5.159 + 98 =
  6. 6.307 + 67 =
  7. 7.185 + 98 =
  8. 8.438 + 38 =
  9. 9.352 + 49 =
  10. 10.364 + 29 =
  11. 11.385 + 88 =
  12. 12.135 + 57 =
  13. 13.148 + 87 =
  14. 14.245 + 17 =
  15. 15.142 + 97 =
  16. 16.284 + 37 =
  17. 17.175 + 29 =
  18. 18.91 + 48 =
  19. 19.403 + 77 =
  20. 20.300 + 67 =
  21. 21.391 + 77 =
  22. 22.351 + 89 =
  23. 23.143 + 18 =
  24. 24.137 + 47 =
  25. 25.138 + 77 =
  26. 26.240 + 69 =
  27. 27.231 + 87 =
  28. 28.423 + 98 =
  29. 29.177 + 97 =
  30. 30.499 + 98 =
  31. 31.242 + 69 =
  32. 32.154 + 78 =
  33. 33.123 + 98 =
  34. 34.71 + 47 =
  35. 35.302 + 49 =
  36. 36.430 + 29 =
  37. 37.216 + 17 =
  38. 38.327 + 17 =
  39. 39.54 + 67 =
  40. 40.365 + 69 =

Answer key

  1. 238
  2. 511
  3. 505
  4. 517
  5. 257
  6. 374
  7. 283
  8. 476
  9. 401
  10. 393
  11. 473
  12. 192
  13. 235
  14. 262
  15. 239
  16. 321
  17. 204
  18. 139
  19. 480
  20. 367
  21. 468
  22. 440
  23. 161
  24. 184
  25. 215
  26. 309
  27. 318
  28. 521
  29. 274
  30. 597
  31. 311
  32. 232
  33. 221
  34. 118
  35. 351
  36. 459
  37. 233
  38. 344
  39. 121
  40. 434

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