Complete the following: one minus four-sevenths equals blank.
To subtract with fractions, we need to have a common denominator which means we need to ask the question how do we write the whole number one as a fraction out of seven. We write seven over seven. The whole number one is equal to seven-sevenths.
When dealing with subtracting fractions, once you have a common denominator, all you have to do is subtract the numerators. Seven minus four is three. And the denominator doesn’t change.
Seven-sevenths minus four-sevenths equals three-sevenths.