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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 921 · 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. 1.203 + 67 =
  2. 2.36 + 28 =
  3. 3.270 + 89 =
  4. 4.85 + 48 =
  5. 5.437 + 59 =
  6. 6.387 + 47 =
  7. 7.468 + 78 =
  8. 8.308 + 37 =
  9. 9.495 + 38 =
  10. 10.497 + 68 =
  11. 11.231 + 97 =
  12. 12.32 + 87 =
  13. 13.171 + 69 =
  14. 14.433 + 58 =
  15. 15.167 + 57 =
  16. 16.217 + 18 =
  17. 17.134 + 28 =
  18. 18.274 + 57 =
  19. 19.46 + 48 =
  20. 20.428 + 49 =
  21. 21.129 + 98 =
  22. 22.365 + 28 =
  23. 23.365 + 27 =
  24. 24.199 + 89 =
  25. 25.400 + 88 =
  26. 26.372 + 39 =
  27. 27.449 + 87 =
  28. 28.387 + 17 =
  29. 29.119 + 28 =
  30. 30.146 + 49 =
  31. 31.110 + 18 =
  32. 32.85 + 69 =
  33. 33.235 + 98 =
  34. 34.56 + 39 =
  35. 35.286 + 39 =
  36. 36.371 + 59 =
  37. 37.374 + 88 =
  38. 38.219 + 99 =
  39. 39.391 + 39 =
  40. 40.303 + 17 =

Answer key

  1. 270
  2. 64
  3. 359
  4. 133
  5. 496
  6. 434
  7. 546
  8. 345
  9. 533
  10. 565
  11. 328
  12. 119
  13. 240
  14. 491
  15. 224
  16. 235
  17. 162
  18. 331
  19. 94
  20. 477
  21. 227
  22. 393
  23. 392
  24. 288
  25. 488
  26. 411
  27. 536
  28. 404
  29. 147
  30. 195
  31. 128
  32. 154
  33. 333
  34. 95
  35. 325
  36. 430
  37. 462
  38. 318
  39. 430
  40. 320

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