2 1/2+2/8 = 6/9+2/5 = 3 1/5+2/5=

1). 11/4
2). 1 1/15
3). 3 3/5
Caranya ubah dulu bentuk pecahan, samakan penyebutnya lalu jumlahkan.

2 1/2 +2/8 = 2+(1/2+2/8)
=2+(4/8+2/8)
=2+6/8= 2 6/8
6/9+2/5 = 30/45 + 18/45
= 48/45 = 1 3/45 = 1 1/15
3 1/5 + 2/5 =3+(1/5+2/5)
=3+(1/5+2/5)
=3+3/5=3 3/5