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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 465 · 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. 1.110 + 38 =
  2. 2.366 + 97 =
  3. 3.423 + 19 =
  4. 4.314 + 59 =
  5. 5.327 + 19 =
  6. 6.113 + 67 =
  7. 7.466 + 98 =
  8. 8.429 + 38 =
  9. 9.359 + 28 =
  10. 10.350 + 78 =
  11. 11.254 + 69 =
  12. 12.282 + 67 =
  13. 13.86 + 98 =
  14. 14.248 + 98 =
  15. 15.105 + 69 =
  16. 16.132 + 17 =
  17. 17.37 + 29 =
  18. 18.116 + 38 =
  19. 19.462 + 97 =
  20. 20.25 + 89 =
  21. 21.493 + 18 =
  22. 22.403 + 37 =
  23. 23.50 + 97 =
  24. 24.139 + 67 =
  25. 25.308 + 19 =
  26. 26.324 + 39 =
  27. 27.223 + 47 =
  28. 28.150 + 98 =
  29. 29.200 + 59 =
  30. 30.138 + 17 =
  31. 31.399 + 67 =
  32. 32.202 + 39 =
  33. 33.441 + 69 =
  34. 34.369 + 29 =
  35. 35.421 + 88 =
  36. 36.395 + 18 =
  37. 37.413 + 48 =
  38. 38.317 + 58 =
  39. 39.404 + 68 =
  40. 40.100 + 59 =

Answer key

  1. 148
  2. 463
  3. 442
  4. 373
  5. 346
  6. 180
  7. 564
  8. 467
  9. 387
  10. 428
  11. 323
  12. 349
  13. 184
  14. 346
  15. 174
  16. 149
  17. 66
  18. 154
  19. 559
  20. 114
  21. 511
  22. 440
  23. 147
  24. 206
  25. 327
  26. 363
  27. 270
  28. 248
  29. 259
  30. 155
  31. 466
  32. 241
  33. 510
  34. 398
  35. 509
  36. 413
  37. 461
  38. 375
  39. 472
  40. 159

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