[tex] \frac{7}{20} + ( - \frac{3}{4} ) = [/tex]
[tex] \frac{7}{20} - \frac{3}{4} = [/tex]
7 x 1 = 7
5 x 3 = 15
20 x 1 = 20
[tex] = \frac{7 - 15}{20} [/tex]
[tex] = \frac{ - 8}{20} [/tex]
[tex] = - \frac{8}{20} [/tex]
[tex] = - \frac{2}{5} [/tex]
So, the number that belongs in the green box is 2.
