I need help with number lines or models on my answers I don’t understand how to get them I need help

Notice that
[tex]\frac{15}{6}=\frac{12+3}{6}=\frac{12}{6}+\frac{3}{6}=2+\frac{3}{6}[/tex]Then, using a pie chart, the subtraction is
Notice that
[tex]\frac{10}{6}=\frac{6+4}{6}=1+\frac{4}{6}=1+\frac{2}{3}[/tex]