1.25 rounded to a whole number would be 1 because the 2 tenths doesn't do that much to round the 1 up to a 2.
1.25 rounded to the nearest tenth would be 1.3 because the 5 lets the 2 round up to a three. **Remember 5 or more, let it score, 4 or less let it rest.
Hope this helped:):)
