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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 253 · 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. 1.79 + 47 =
  2. 2.329 + 58 =
  3. 3.194 + 67 =
  4. 4.175 + 97 =
  5. 5.112 + 17 =
  6. 6.156 + 88 =
  7. 7.169 + 87 =
  8. 8.64 + 97 =
  9. 9.159 + 48 =
  10. 10.225 + 37 =
  11. 11.420 + 67 =
  12. 12.82 + 48 =
  13. 13.343 + 29 =
  14. 14.310 + 28 =
  15. 15.449 + 28 =
  16. 16.152 + 78 =
  17. 17.362 + 69 =
  18. 18.104 + 69 =
  19. 19.224 + 77 =
  20. 20.223 + 69 =
  21. 21.278 + 19 =
  22. 22.452 + 67 =
  23. 23.329 + 48 =
  24. 24.151 + 47 =
  25. 25.180 + 58 =
  26. 26.293 + 37 =
  27. 27.114 + 27 =
  28. 28.281 + 68 =
  29. 29.485 + 37 =
  30. 30.477 + 59 =
  31. 31.141 + 17 =
  32. 32.99 + 97 =
  33. 33.164 + 68 =
  34. 34.55 + 67 =
  35. 35.330 + 79 =
  36. 36.42 + 88 =
  37. 37.453 + 19 =
  38. 38.421 + 38 =
  39. 39.81 + 39 =
  40. 40.252 + 29 =

Answer key

  1. 126
  2. 387
  3. 261
  4. 272
  5. 129
  6. 244
  7. 256
  8. 161
  9. 207
  10. 262
  11. 487
  12. 130
  13. 372
  14. 338
  15. 477
  16. 230
  17. 431
  18. 173
  19. 301
  20. 292
  21. 297
  22. 519
  23. 377
  24. 198
  25. 238
  26. 330
  27. 141
  28. 349
  29. 522
  30. 536
  31. 158
  32. 196
  33. 232
  34. 122
  35. 409
  36. 130
  37. 472
  38. 459
  39. 120
  40. 281

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