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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 830 · 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. 1.463 + 97 =
  2. 2.169 + 18 =
  3. 3.222 + 47 =
  4. 4.182 + 48 =
  5. 5.162 + 17 =
  6. 6.452 + 67 =
  7. 7.179 + 69 =
  8. 8.336 + 37 =
  9. 9.98 + 57 =
  10. 10.385 + 48 =
  11. 11.221 + 97 =
  12. 12.29 + 47 =
  13. 13.239 + 57 =
  14. 14.345 + 17 =
  15. 15.56 + 78 =
  16. 16.338 + 78 =
  17. 17.133 + 17 =
  18. 18.374 + 69 =
  19. 19.321 + 57 =
  20. 20.306 + 27 =
  21. 21.401 + 59 =
  22. 22.192 + 19 =
  23. 23.385 + 87 =
  24. 24.124 + 67 =
  25. 25.101 + 58 =
  26. 26.144 + 68 =
  27. 27.303 + 57 =
  28. 28.239 + 49 =
  29. 29.32 + 88 =
  30. 30.86 + 38 =
  31. 31.48 + 98 =
  32. 32.152 + 47 =
  33. 33.230 + 37 =
  34. 34.313 + 18 =
  35. 35.49 + 18 =
  36. 36.65 + 27 =
  37. 37.218 + 69 =
  38. 38.278 + 49 =
  39. 39.250 + 97 =
  40. 40.214 + 38 =

Answer key

  1. 560
  2. 187
  3. 269
  4. 230
  5. 179
  6. 519
  7. 248
  8. 373
  9. 155
  10. 433
  11. 318
  12. 76
  13. 296
  14. 362
  15. 134
  16. 416
  17. 150
  18. 443
  19. 378
  20. 333
  21. 460
  22. 211
  23. 472
  24. 191
  25. 159
  26. 212
  27. 360
  28. 288
  29. 120
  30. 124
  31. 146
  32. 199
  33. 267
  34. 331
  35. 67
  36. 92
  37. 287
  38. 327
  39. 347
  40. 252

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