karin memiliki kain 2 2/5,membeli lagi 3/4 digunakan 2 1/4 sisa kain?

=12/5 + 3/4 - 9/4
=(12/5 + 3/4) - 9/4
=(48/20 + 15/20) - 9/4
=65/20 - 9/4

=65/20 - 45/20
=20/20
=1

jadi, sisa kain karin 1 m