Question

$\frac{3}{10} + \frac{1}{2} \: \: \: \: \: \\ 1 + \frac{2}{10}$

Answer 1

Para resolver adição de fração :

Multiplicar cruzado, denominador por numerador e multiplicar denominador por denominador : 

$\mathtt{\dfrac{3}{10} + \dfrac{1}{2}~~=~~\dfrac{6 + 10}{20}~~=~~ \dfrac{16}{20}~~(\div4)~~=~~ \dfrac{4}{5}} \\ \\ \\ \mathtt{\dfrac{1}{1} + \dfrac{2}{10}~~=~~ \dfrac{10 + 2}{10}~~=~~\dfrac{12}{10}~~(\div2) ~~=~~ \dfrac{6}{5}}$