← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 493 · 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. 1.366 + 27 =
  2. 2.257 + 87 =
  3. 3.34 + 38 =
  4. 4.118 + 89 =
  5. 5.471 + 18 =
  6. 6.405 + 58 =
  7. 7.362 + 38 =
  8. 8.86 + 27 =
  9. 9.355 + 29 =
  10. 10.123 + 38 =
  11. 11.131 + 78 =
  12. 12.140 + 89 =
  13. 13.53 + 57 =
  14. 14.323 + 68 =
  15. 15.314 + 58 =
  16. 16.386 + 27 =
  17. 17.375 + 77 =
  18. 18.175 + 28 =
  19. 19.429 + 77 =
  20. 20.175 + 69 =
  21. 21.329 + 68 =
  22. 22.156 + 27 =
  23. 23.490 + 39 =
  24. 24.132 + 27 =
  25. 25.69 + 48 =
  26. 26.137 + 19 =
  27. 27.78 + 99 =
  28. 28.339 + 49 =
  29. 29.277 + 87 =
  30. 30.248 + 87 =
  31. 31.270 + 28 =
  32. 32.154 + 97 =
  33. 33.167 + 69 =
  34. 34.56 + 97 =
  35. 35.424 + 57 =
  36. 36.455 + 97 =
  37. 37.360 + 88 =
  38. 38.38 + 18 =
  39. 39.425 + 79 =
  40. 40.90 + 29 =

Answer key

  1. 393
  2. 344
  3. 72
  4. 207
  5. 489
  6. 463
  7. 400
  8. 113
  9. 384
  10. 161
  11. 209
  12. 229
  13. 110
  14. 391
  15. 372
  16. 413
  17. 452
  18. 203
  19. 506
  20. 244
  21. 397
  22. 183
  23. 529
  24. 159
  25. 117
  26. 156
  27. 177
  28. 388
  29. 364
  30. 335
  31. 298
  32. 251
  33. 236
  34. 153
  35. 481
  36. 552
  37. 448
  38. 56
  39. 504
  40. 119

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