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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 507 · 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. 1.434 + 47 =
  2. 2.154 + 47 =
  3. 3.478 + 88 =
  4. 4.477 + 48 =
  5. 5.163 + 87 =
  6. 6.163 + 28 =
  7. 7.190 + 17 =
  8. 8.262 + 79 =
  9. 9.127 + 47 =
  10. 10.423 + 17 =
  11. 11.389 + 77 =
  12. 12.300 + 39 =
  13. 13.209 + 39 =
  14. 14.420 + 17 =
  15. 15.323 + 29 =
  16. 16.487 + 39 =
  17. 17.264 + 19 =
  18. 18.237 + 87 =
  19. 19.109 + 89 =
  20. 20.50 + 57 =
  21. 21.471 + 47 =
  22. 22.482 + 59 =
  23. 23.270 + 97 =
  24. 24.50 + 28 =
  25. 25.407 + 38 =
  26. 26.54 + 69 =
  27. 27.153 + 49 =
  28. 28.104 + 59 =
  29. 29.263 + 28 =
  30. 30.495 + 38 =
  31. 31.420 + 97 =
  32. 32.213 + 28 =
  33. 33.240 + 17 =
  34. 34.64 + 57 =
  35. 35.171 + 38 =
  36. 36.26 + 67 =
  37. 37.419 + 88 =
  38. 38.268 + 17 =
  39. 39.231 + 97 =
  40. 40.50 + 48 =

Answer key

  1. 481
  2. 201
  3. 566
  4. 525
  5. 250
  6. 191
  7. 207
  8. 341
  9. 174
  10. 440
  11. 466
  12. 339
  13. 248
  14. 437
  15. 352
  16. 526
  17. 283
  18. 324
  19. 198
  20. 107
  21. 518
  22. 541
  23. 367
  24. 78
  25. 445
  26. 123
  27. 202
  28. 163
  29. 291
  30. 533
  31. 517
  32. 241
  33. 257
  34. 121
  35. 209
  36. 93
  37. 507
  38. 285
  39. 328
  40. 98

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