You cant simplify 7/10.
You would be able to simplify a fraction if the numerator and denominator both have a number they both go into evenly.
For example: 10/40 or 7/21
For 10/40 you would divide your numerator and denominator by 10 because 10 goes into both 10 and 40
For 7/21 you would divide your numerator and denominator by 7 because 7 goes evenly into both 7 and 21.
