28 is one what u have to do is find a number that 4 and seven go in to.
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3 1 7 4 + 8 is 8. Remember to change the denominators into common denominators. (3/4 would turn into 6/8)
you subtract the top 2 numbers and then leave the denominators the same like: 7/8-4/8=3/8. Get it?
Only 1.
The denominator of 3/4 is 4 The denominator of 7/10 is 10 4 and 10 are not the same number so the two fractions are said to have unlike denominators.