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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 850 · 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. 1.60 + 29 =
  2. 2.281 + 58 =
  3. 3.47 + 88 =
  4. 4.298 + 98 =
  5. 5.269 + 57 =
  6. 6.74 + 47 =
  7. 7.54 + 18 =
  8. 8.317 + 77 =
  9. 9.459 + 39 =
  10. 10.183 + 29 =
  11. 11.232 + 98 =
  12. 12.489 + 77 =
  13. 13.338 + 67 =
  14. 14.122 + 79 =
  15. 15.387 + 27 =
  16. 16.348 + 88 =
  17. 17.283 + 29 =
  18. 18.106 + 88 =
  19. 19.439 + 19 =
  20. 20.54 + 68 =
  21. 21.355 + 68 =
  22. 22.162 + 69 =
  23. 23.56 + 18 =
  24. 24.81 + 99 =
  25. 25.176 + 78 =
  26. 26.84 + 28 =
  27. 27.144 + 29 =
  28. 28.230 + 37 =
  29. 29.205 + 97 =
  30. 30.220 + 19 =
  31. 31.178 + 68 =
  32. 32.365 + 58 =
  33. 33.259 + 78 =
  34. 34.285 + 47 =
  35. 35.149 + 57 =
  36. 36.341 + 18 =
  37. 37.28 + 67 =
  38. 38.200 + 38 =
  39. 39.219 + 37 =
  40. 40.165 + 88 =

Answer key

  1. 89
  2. 339
  3. 135
  4. 396
  5. 326
  6. 121
  7. 72
  8. 394
  9. 498
  10. 212
  11. 330
  12. 566
  13. 405
  14. 201
  15. 414
  16. 436
  17. 312
  18. 194
  19. 458
  20. 122
  21. 423
  22. 231
  23. 74
  24. 180
  25. 254
  26. 112
  27. 173
  28. 267
  29. 302
  30. 239
  31. 246
  32. 423
  33. 337
  34. 332
  35. 206
  36. 359
  37. 95
  38. 238
  39. 256
  40. 253

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