Answer. 5/7 Explanation. In order to subtract two fractions, the denominators must be the same to receive the difference. So, let’s fine the least common denominator: To get the denominator (4) to 28, we must multiply the fraction by 7. 21/28- 1/28, yeh denominator does not change, now we must simply subtract the numerators. 21- 1= 20. Our answer is 20/28 which can reduce/simplify to 5/7. Hope this helps, let me know if it’s correct so others can use it :) Good luck.
