To add or subtract two fractions with the same denominators, add or subtract their numerators and leave the denominator the same.
Examples of adding fractions with the same denominators
1)
15/25
+
4/25
=
15 + 4/25
=
19/25
2)
12/23
+
11/23
=
12+11/23
=
23/23
= 1
3)
11/16
+
1/16
=
11+1/16
=
12/16
=
3*4/4*4
=
3/4
