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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 724 · 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. 1.119 + 67 =
  2. 2.247 + 28 =
  3. 3.183 + 48 =
  4. 4.464 + 27 =
  5. 5.383 + 88 =
  6. 6.45 + 59 =
  7. 7.166 + 69 =
  8. 8.335 + 89 =
  9. 9.33 + 87 =
  10. 10.382 + 19 =
  11. 11.115 + 97 =
  12. 12.237 + 47 =
  13. 13.218 + 27 =
  14. 14.54 + 48 =
  15. 15.450 + 48 =
  16. 16.371 + 47 =
  17. 17.84 + 67 =
  18. 18.445 + 99 =
  19. 19.427 + 97 =
  20. 20.306 + 89 =
  21. 21.327 + 17 =
  22. 22.433 + 27 =
  23. 23.205 + 27 =
  24. 24.431 + 39 =
  25. 25.498 + 28 =
  26. 26.239 + 98 =
  27. 27.112 + 57 =
  28. 28.164 + 57 =
  29. 29.104 + 98 =
  30. 30.463 + 19 =
  31. 31.458 + 28 =
  32. 32.200 + 57 =
  33. 33.351 + 19 =
  34. 34.157 + 47 =
  35. 35.414 + 19 =
  36. 36.423 + 59 =
  37. 37.400 + 17 =
  38. 38.246 + 59 =
  39. 39.64 + 67 =
  40. 40.35 + 38 =

Answer key

  1. 186
  2. 275
  3. 231
  4. 491
  5. 471
  6. 104
  7. 235
  8. 424
  9. 120
  10. 401
  11. 212
  12. 284
  13. 245
  14. 102
  15. 498
  16. 418
  17. 151
  18. 544
  19. 524
  20. 395
  21. 344
  22. 460
  23. 232
  24. 470
  25. 526
  26. 337
  27. 169
  28. 221
  29. 202
  30. 482
  31. 486
  32. 257
  33. 370
  34. 204
  35. 433
  36. 482
  37. 417
  38. 305
  39. 131
  40. 73

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