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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 667 · 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. 1.42 + 17 =
  2. 2.136 + 88 =
  3. 3.182 + 39 =
  4. 4.475 + 67 =
  5. 5.132 + 98 =
  6. 6.156 + 57 =
  7. 7.404 + 28 =
  8. 8.389 + 79 =
  9. 9.125 + 77 =
  10. 10.425 + 17 =
  11. 11.69 + 88 =
  12. 12.145 + 68 =
  13. 13.113 + 58 =
  14. 14.370 + 28 =
  15. 15.132 + 87 =
  16. 16.240 + 37 =
  17. 17.334 + 87 =
  18. 18.464 + 68 =
  19. 19.48 + 59 =
  20. 20.140 + 49 =
  21. 21.154 + 57 =
  22. 22.291 + 69 =
  23. 23.487 + 78 =
  24. 24.221 + 58 =
  25. 25.190 + 58 =
  26. 26.251 + 18 =
  27. 27.463 + 18 =
  28. 28.481 + 89 =
  29. 29.351 + 48 =
  30. 30.495 + 37 =
  31. 31.176 + 99 =
  32. 32.189 + 37 =
  33. 33.141 + 37 =
  34. 34.445 + 99 =
  35. 35.346 + 67 =
  36. 36.484 + 37 =
  37. 37.286 + 49 =
  38. 38.340 + 48 =
  39. 39.315 + 88 =
  40. 40.69 + 18 =

Answer key

  1. 59
  2. 224
  3. 221
  4. 542
  5. 230
  6. 213
  7. 432
  8. 468
  9. 202
  10. 442
  11. 157
  12. 213
  13. 171
  14. 398
  15. 219
  16. 277
  17. 421
  18. 532
  19. 107
  20. 189
  21. 211
  22. 360
  23. 565
  24. 279
  25. 248
  26. 269
  27. 481
  28. 570
  29. 399
  30. 532
  31. 275
  32. 226
  33. 178
  34. 544
  35. 413
  36. 521
  37. 335
  38. 388
  39. 403
  40. 87

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