← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 679 · 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. 1.82 + 87 =
  2. 2.135 + 49 =
  3. 3.314 + 29 =
  4. 4.232 + 19 =
  5. 5.117 + 17 =
  6. 6.493 + 89 =
  7. 7.306 + 19 =
  8. 8.69 + 97 =
  9. 9.396 + 37 =
  10. 10.239 + 29 =
  11. 11.277 + 78 =
  12. 12.115 + 87 =
  13. 13.146 + 39 =
  14. 14.213 + 98 =
  15. 15.33 + 79 =
  16. 16.108 + 98 =
  17. 17.147 + 27 =
  18. 18.178 + 98 =
  19. 19.338 + 58 =
  20. 20.225 + 69 =
  21. 21.93 + 27 =
  22. 22.490 + 67 =
  23. 23.203 + 68 =
  24. 24.105 + 69 =
  25. 25.382 + 37 =
  26. 26.153 + 17 =
  27. 27.246 + 28 =
  28. 28.465 + 28 =
  29. 29.241 + 67 =
  30. 30.123 + 88 =
  31. 31.282 + 47 =
  32. 32.334 + 37 =
  33. 33.483 + 37 =
  34. 34.152 + 79 =
  35. 35.25 + 57 =
  36. 36.398 + 47 =
  37. 37.272 + 87 =
  38. 38.420 + 68 =
  39. 39.349 + 17 =
  40. 40.218 + 97 =

Answer key

  1. 169
  2. 184
  3. 343
  4. 251
  5. 134
  6. 582
  7. 325
  8. 166
  9. 433
  10. 268
  11. 355
  12. 202
  13. 185
  14. 311
  15. 112
  16. 206
  17. 174
  18. 276
  19. 396
  20. 294
  21. 120
  22. 557
  23. 271
  24. 174
  25. 419
  26. 170
  27. 274
  28. 493
  29. 308
  30. 211
  31. 329
  32. 371
  33. 520
  34. 231
  35. 82
  36. 445
  37. 359
  38. 488
  39. 366
  40. 315

Free speed calculation lessons, practice and worksheets at talentjr.in/speed-maths