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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 928 · 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. 1.175 + 59 =
  2. 2.326 + 77 =
  3. 3.290 + 59 =
  4. 4.417 + 97 =
  5. 5.112 + 57 =
  6. 6.486 + 79 =
  7. 7.126 + 28 =
  8. 8.197 + 78 =
  9. 9.258 + 28 =
  10. 10.431 + 79 =
  11. 11.28 + 18 =
  12. 12.469 + 49 =
  13. 13.53 + 77 =
  14. 14.117 + 17 =
  15. 15.469 + 77 =
  16. 16.193 + 27 =
  17. 17.328 + 48 =
  18. 18.152 + 18 =
  19. 19.454 + 97 =
  20. 20.118 + 77 =
  21. 21.104 + 39 =
  22. 22.263 + 79 =
  23. 23.343 + 97 =
  24. 24.29 + 77 =
  25. 25.206 + 67 =
  26. 26.141 + 38 =
  27. 27.442 + 27 =
  28. 28.142 + 37 =
  29. 29.402 + 17 =
  30. 30.98 + 69 =
  31. 31.219 + 77 =
  32. 32.387 + 38 =
  33. 33.27 + 48 =
  34. 34.271 + 29 =
  35. 35.430 + 47 =
  36. 36.196 + 59 =
  37. 37.217 + 47 =
  38. 38.45 + 68 =
  39. 39.281 + 87 =
  40. 40.261 + 19 =

Answer key

  1. 234
  2. 403
  3. 349
  4. 514
  5. 169
  6. 565
  7. 154
  8. 275
  9. 286
  10. 510
  11. 46
  12. 518
  13. 130
  14. 134
  15. 546
  16. 220
  17. 376
  18. 170
  19. 551
  20. 195
  21. 143
  22. 342
  23. 440
  24. 106
  25. 273
  26. 179
  27. 469
  28. 179
  29. 419
  30. 167
  31. 296
  32. 425
  33. 75
  34. 300
  35. 477
  36. 255
  37. 264
  38. 113
  39. 368
  40. 280

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