1)1/2+2/4= 2)3/4-5/8= 3)2/3-3/5= 4)5/12+4/9=

1)[latex] \frac{1}{2} + \frac{2}{4} = \frac{1*2}{2*2}+\frac{2}{4} =\frac{2}{4}+\frac{2}{4}=1[/latex] 2)[latex] \frac{3}{4}-\frac{5}{8} =\frac{3*2}{4*2}-\frac{5}{8}=\frac{6}{8}-\frac{5}{8} =\frac{1}{8}[/latex] 3)[latex] \frac{2}{3}-\frac{3}{5} = \frac{2*5}{3*5}- \frac{3*3}{5*3} =\frac{10}{15}- \frac{9}{15} =\frac{1}{15}[/latex] 4)[latex] \frac{5}{12}+ \frac{4}{9} = \frac{5*3}{12*3}+ \frac{4*4}{9*4} =\frac{15}{36}+ \frac{16}{36} = \frac{31}{36}[/latex]

1 1/2 + 2/4= 1/2*2 + 2/4 = 2/4 + 2/4 = 4/4 = 1 2.3/4-5/8 = 3/4*4 - 5/8*2 = 12/16-10/16= 2/16 = 1/8 3. 2/3 - 3/5 = 2/3*5 -3/5*3 = 10/15-9/15= 1/15 4. 5/12+4/9= 5/12*3 +4/9*4 = 15/36+ 16/36 = 31/36 = 1 1/6