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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 207 · 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. 1.479 + 19 =
  2. 2.430 + 67 =
  3. 3.216 + 47 =
  4. 4.158 + 17 =
  5. 5.91 + 69 =
  6. 6.345 + 68 =
  7. 7.496 + 89 =
  8. 8.346 + 89 =
  9. 9.436 + 69 =
  10. 10.176 + 18 =
  11. 11.422 + 68 =
  12. 12.408 + 77 =
  13. 13.265 + 37 =
  14. 14.117 + 38 =
  15. 15.33 + 19 =
  16. 16.218 + 68 =
  17. 17.116 + 59 =
  18. 18.449 + 78 =
  19. 19.343 + 27 =
  20. 20.371 + 87 =
  21. 21.195 + 87 =
  22. 22.487 + 17 =
  23. 23.40 + 98 =
  24. 24.354 + 99 =
  25. 25.179 + 38 =
  26. 26.473 + 47 =
  27. 27.112 + 29 =
  28. 28.345 + 49 =
  29. 29.307 + 28 =
  30. 30.382 + 99 =
  31. 31.380 + 58 =
  32. 32.494 + 77 =
  33. 33.355 + 67 =
  34. 34.301 + 27 =
  35. 35.119 + 39 =
  36. 36.495 + 27 =
  37. 37.152 + 77 =
  38. 38.58 + 99 =
  39. 39.141 + 79 =
  40. 40.165 + 97 =

Answer key

  1. 498
  2. 497
  3. 263
  4. 175
  5. 160
  6. 413
  7. 585
  8. 435
  9. 505
  10. 194
  11. 490
  12. 485
  13. 302
  14. 155
  15. 52
  16. 286
  17. 175
  18. 527
  19. 370
  20. 458
  21. 282
  22. 504
  23. 138
  24. 453
  25. 217
  26. 520
  27. 141
  28. 394
  29. 335
  30. 481
  31. 438
  32. 571
  33. 422
  34. 328
  35. 158
  36. 522
  37. 229
  38. 157
  39. 220
  40. 262

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