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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 440 · 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. 1.309 + 69 =
  2. 2.185 + 58 =
  3. 3.284 + 59 =
  4. 4.404 + 37 =
  5. 5.54 + 47 =
  6. 6.96 + 27 =
  7. 7.219 + 19 =
  8. 8.67 + 48 =
  9. 9.36 + 79 =
  10. 10.44 + 28 =
  11. 11.39 + 38 =
  12. 12.458 + 19 =
  13. 13.275 + 67 =
  14. 14.315 + 27 =
  15. 15.381 + 69 =
  16. 16.128 + 27 =
  17. 17.121 + 97 =
  18. 18.311 + 58 =
  19. 19.471 + 77 =
  20. 20.281 + 98 =
  21. 21.178 + 57 =
  22. 22.472 + 37 =
  23. 23.342 + 28 =
  24. 24.461 + 48 =
  25. 25.406 + 29 =
  26. 26.142 + 77 =
  27. 27.195 + 87 =
  28. 28.316 + 89 =
  29. 29.57 + 67 =
  30. 30.280 + 79 =
  31. 31.193 + 19 =
  32. 32.48 + 59 =
  33. 33.51 + 17 =
  34. 34.156 + 28 =
  35. 35.175 + 77 =
  36. 36.201 + 57 =
  37. 37.491 + 37 =
  38. 38.194 + 29 =
  39. 39.396 + 89 =
  40. 40.34 + 48 =

Answer key

  1. 378
  2. 243
  3. 343
  4. 441
  5. 101
  6. 123
  7. 238
  8. 115
  9. 115
  10. 72
  11. 77
  12. 477
  13. 342
  14. 342
  15. 450
  16. 155
  17. 218
  18. 369
  19. 548
  20. 379
  21. 235
  22. 509
  23. 370
  24. 509
  25. 435
  26. 219
  27. 282
  28. 405
  29. 124
  30. 359
  31. 212
  32. 107
  33. 68
  34. 184
  35. 252
  36. 258
  37. 528
  38. 223
  39. 485
  40. 82

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