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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 479 · 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. 1.127 + 29 =
  2. 2.64 + 87 =
  3. 3.142 + 27 =
  4. 4.198 + 98 =
  5. 5.162 + 47 =
  6. 6.161 + 99 =
  7. 7.163 + 27 =
  8. 8.139 + 57 =
  9. 9.188 + 38 =
  10. 10.381 + 69 =
  11. 11.97 + 87 =
  12. 12.167 + 88 =
  13. 13.285 + 47 =
  14. 14.462 + 17 =
  15. 15.455 + 19 =
  16. 16.289 + 57 =
  17. 17.243 + 19 =
  18. 18.235 + 58 =
  19. 19.53 + 29 =
  20. 20.487 + 67 =
  21. 21.236 + 99 =
  22. 22.250 + 19 =
  23. 23.317 + 87 =
  24. 24.410 + 68 =
  25. 25.418 + 57 =
  26. 26.487 + 29 =
  27. 27.146 + 57 =
  28. 28.221 + 87 =
  29. 29.54 + 69 =
  30. 30.160 + 79 =
  31. 31.332 + 29 =
  32. 32.146 + 78 =
  33. 33.348 + 29 =
  34. 34.371 + 87 =
  35. 35.479 + 49 =
  36. 36.104 + 97 =
  37. 37.132 + 38 =
  38. 38.51 + 69 =
  39. 39.411 + 67 =
  40. 40.328 + 59 =

Answer key

  1. 156
  2. 151
  3. 169
  4. 296
  5. 209
  6. 260
  7. 190
  8. 196
  9. 226
  10. 450
  11. 184
  12. 255
  13. 332
  14. 479
  15. 474
  16. 346
  17. 262
  18. 293
  19. 82
  20. 554
  21. 335
  22. 269
  23. 404
  24. 478
  25. 475
  26. 516
  27. 203
  28. 308
  29. 123
  30. 239
  31. 361
  32. 224
  33. 377
  34. 458
  35. 528
  36. 201
  37. 170
  38. 120
  39. 478
  40. 387

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