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flaviasweet67
the sum is:
2/5+2/4=
2/5+2/4÷20=
8+10/20
=18/20
9/10
hope u found it useful
unicorn3125
[tex] \frac{2}{5} + \frac{2}{4}=\frac{2\cdot4}{5\cdot4} + \frac{2\cdot5}{4\cdot5}=\frac{8}{20} + \frac{10}{20}= \frac{8+10}{20}=\frac{18}{20}=\frac{9\cdot2}{10\cdot2}=\frac{9}{10} [/tex]