Question

how to subtract mixed numbers with unlike denominators

Answer 1

find common denominators ...12 then subtract

Answer 2

First, convert to an improper fraction ($a\frac{b}{c} = \frac{ac+b}{c}$

Next, find common denominator and multiply.

Finally, subtract.

$3\frac{1}{3} - 2\frac{1}{4}\\=\frac{3*3+1}{3} - \frac{2*4+1}{4}\\\frac{10}{3} - \frac{9}{4}$

$\frac{10*4}{3*4} - \frac{9*3}{4*3}\\=\frac{40}{12} - \frac{27}{12}\\\frac{13}{12} = 1\frac{1}{12}$

The anser is 1 1/12, or 13/12