1. Add
Frac(ons
With
Unlike
Denominators
1 3
Example:
5 + 4
To
add
frac)ons
with
different
denominators,
convert
them
so
they
have
the
same
€
denominators.
1. Find
the
least
common
denominator
(LCD),
which
is
the
least
common
mul)ple
of
the
denominators.
Mul)ples
of
5:
5,
10,
15,
20
Mul)ples
of
4:
4,
8,
10,
12,
16,
20

2. Add
Frac(ons
With
Unlike
Denominators
1 3
Example:
+
5 4
2. Rename
the
frac)ons
using
the
least
common
denominator.
€
1 4 4
× =
5 4 20
3 5 15
× =
4 5 20

3. Add
Frac(ons
With
Unlike
Denominators
Example:
1 + 3
5 4
3. Add
the
numerators.
Reduce
if
necessary.
1 4 4
€ × =
5 4 20
3 5 15
× =
4 5 +_____
20
19
20
€

4. Add
Frac(ons
With
Unlike
Denominators
1 3
Example:
5 + 4
To
add
frac)ons
with
different
denominators,
convert
them
so
they
have
the
same
denominators.
€
1. Find
the
least
common
denominator
(LCD),
which
is
the
least
common
mul)ple
of
the
denominators.
Mul)ples
of
5:
5,
10,
15,
20
Mul)ples
of
4:
4,
8,
10,
12,
16,
20
2. Rename
the
frac)ons
using
the
least
common
denominator.
1 4 4
× =
5 4 20
3 5 15
× =
4 5 20
3. Add
the
numerators.
+
_____
19
Reduce
if
necessary.
20
€