[tex]- \frac{4}{5} + \frac{3}{20} [/tex]
First, find the LCD of the two denominators.
Multiples of 5: 5, 10, 15, 20
Multiples of 20: 20
The LCD is 20.
Second, make the denominators the same as the LCD. / Your problem should look like: [tex] -\frac{4x4}{5x4} + \frac{3}{20} [/tex]
Third, simplify so that the denominators are the same. / Your problem should look like: [tex]- \frac{16}{20} + \frac{3}{20} [/tex]
Fourth, combine the denominators. / Your problem should look like: [tex] \frac{-16+3}{20} [/tex]
Fifth, simplify. / Your problem should look like: [tex] -\frac{13}{20} [/tex]
Answer as fraction: [tex]- \frac{13}{20} [/tex]
Answer as decimal: -0.65
