Subtraction of Fractions

1. Subtract
2
5
from
3
5
.

  
3
5
2
5

=
3 - 2
5

=
1
5

2. Mrs. Chopra had a cake.
     She gave
1
2
of the cake to Nadia and
2
5
of the cake to Nancy.
     Who received more? How much more?

When the fractions to be subtracted have different denominators, we must first change them to their equivalent fractions with the same denominator.

Nadia:
1
2
=
5
10

Nancy:
2
5
=
4
10


5
10
is greater than
4
10

So, Nadia received more cake than Nancy.

    
1
2
2
5

=
5
10
4
10

=
1
10


Nadia received
1
10
more of the cake than Nancy.

3. Josh and Halle bought a pizza.
     Josh ate
1
3
of the pizza and Halle ate
7
12
of the pizza.
     What fraction of the pizza was left?

Josh:
1
3
=
4
12

Halle:
7
12


     1 −
4
12
7
12

=
12
12
4
12
7
12

=
1
12


1
12
of the pizza was left.