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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 820 · 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. 1.190 + 29 =
  2. 2.463 + 87 =
  3. 3.33 + 77 =
  4. 4.431 + 67 =
  5. 5.64 + 37 =
  6. 6.378 + 49 =
  7. 7.384 + 49 =
  8. 8.470 + 89 =
  9. 9.147 + 39 =
  10. 10.487 + 88 =
  11. 11.169 + 19 =
  12. 12.203 + 47 =
  13. 13.108 + 69 =
  14. 14.474 + 69 =
  15. 15.323 + 97 =
  16. 16.159 + 88 =
  17. 17.318 + 17 =
  18. 18.475 + 48 =
  19. 19.95 + 89 =
  20. 20.367 + 99 =
  21. 21.373 + 87 =
  22. 22.374 + 47 =
  23. 23.301 + 49 =
  24. 24.494 + 39 =
  25. 25.77 + 48 =
  26. 26.388 + 28 =
  27. 27.393 + 38 =
  28. 28.242 + 78 =
  29. 29.469 + 87 =
  30. 30.74 + 67 =
  31. 31.169 + 29 =
  32. 32.241 + 99 =
  33. 33.428 + 58 =
  34. 34.232 + 99 =
  35. 35.358 + 78 =
  36. 36.151 + 37 =
  37. 37.35 + 39 =
  38. 38.231 + 88 =
  39. 39.358 + 37 =
  40. 40.421 + 18 =

Answer key

  1. 219
  2. 550
  3. 110
  4. 498
  5. 101
  6. 427
  7. 433
  8. 559
  9. 186
  10. 575
  11. 188
  12. 250
  13. 177
  14. 543
  15. 420
  16. 247
  17. 335
  18. 523
  19. 184
  20. 466
  21. 460
  22. 421
  23. 350
  24. 533
  25. 125
  26. 416
  27. 431
  28. 320
  29. 556
  30. 141
  31. 198
  32. 340
  33. 486
  34. 331
  35. 436
  36. 188
  37. 74
  38. 319
  39. 395
  40. 439

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