Transcript Adding and Subtracting Like Fractions

Fractions With Like
Denominators
Lesson 4-2
Terminology
Like decimals, fractions represent parts of numbers. A
fraction is usually a number that is between 0 and 1.
Numerator - number on top
Denominator - number on bottom
To add or subtract fractions
with like denominators:
• If the denominators are already the same,
then you’re ready to add or subtract.
• Add or subtract the numerators. Keep the
denominators the same.
• Simplify (reduce) the fraction, if possible.
• If you end up with an improper fraction,
change it to a mixed number.
Examples
1
5
2
+
5
=
This answer cannot be
reduced any further.
3
5
9
14
5 = 4 ÷2= 2
14
14
7
The GCF of 4 and 14 is 2, so we divide by 2 to
reduce.
8
9
3
+ 9
11
= 9
This is an improper fraction (the top is bigger than the
bottom), so we want to change it to a mixed number.
To do this, divide the bottom into the top.
1
9 11
9
2
Answer:
1
2
9
Try Some
7
12
5
1
=
6
12
4
1
5
+
=
7
7
7
8 + 12
=
15
15
1
1
3
Homework Time!