Common Denominators - Add Subtract

adding fractions and subtracting fractions

Lysbilde: 1
1 7
5 7
6 7
When fractions have the same denominator, adding fractions is easy! Just add the numerators.
Lysbilde: 2
?
?
3 8
1 4
4 12
When the denominators are different, it is much trickier!
Lysbilde: 3
Re-name-inator
=
2 8
1 4
We just have to rename the fractions before we can do anything with them! You shall become re-name-inators!
Lysbilde: 4
3 8
1 4
3 8
2 8
5 8
Once you rename the fractions so they all have the same denominators, adding and subtracting fractions is easy again.