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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 784 · 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. 1.430 + 97 =
  2. 2.323 + 59 =
  3. 3.129 + 39 =
  4. 4.159 + 17 =
  5. 5.318 + 98 =
  6. 6.287 + 27 =
  7. 7.132 + 99 =
  8. 8.97 + 77 =
  9. 9.331 + 29 =
  10. 10.486 + 77 =
  11. 11.284 + 28 =
  12. 12.338 + 17 =
  13. 13.92 + 99 =
  14. 14.51 + 39 =
  15. 15.387 + 57 =
  16. 16.169 + 99 =
  17. 17.347 + 97 =
  18. 18.443 + 78 =
  19. 19.490 + 87 =
  20. 20.207 + 57 =
  21. 21.234 + 27 =
  22. 22.223 + 98 =
  23. 23.388 + 17 =
  24. 24.160 + 87 =
  25. 25.210 + 58 =
  26. 26.389 + 48 =
  27. 27.392 + 49 =
  28. 28.304 + 57 =
  29. 29.430 + 57 =
  30. 30.145 + 27 =
  31. 31.220 + 98 =
  32. 32.287 + 29 =
  33. 33.417 + 88 =
  34. 34.375 + 59 =
  35. 35.185 + 27 =
  36. 36.341 + 67 =
  37. 37.382 + 89 =
  38. 38.129 + 99 =
  39. 39.37 + 38 =
  40. 40.224 + 48 =

Answer key

  1. 527
  2. 382
  3. 168
  4. 176
  5. 416
  6. 314
  7. 231
  8. 174
  9. 360
  10. 563
  11. 312
  12. 355
  13. 191
  14. 90
  15. 444
  16. 268
  17. 444
  18. 521
  19. 577
  20. 264
  21. 261
  22. 321
  23. 405
  24. 247
  25. 268
  26. 437
  27. 441
  28. 361
  29. 487
  30. 172
  31. 318
  32. 316
  33. 505
  34. 434
  35. 212
  36. 408
  37. 471
  38. 228
  39. 75
  40. 272

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