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Answer:
[tex] \frac{13}{20} [/tex]
Step-by-step explanation:
[tex] \frac{1}{4} + \frac{2}{5} [/tex]
First, we need to make the demoninators the same so we times 4 by 5 and whatever we do to the bottom, we do to the top, and 5 by 4.
[tex] \frac{ 1 \times 5}{4 \times 5} + \frac{2 \times 4}{5 \times 4} [/tex]
[tex] \frac{5}{20} + \frac{8}{20} [/tex]
[tex] = \frac{13}{20} [/tex]
demoninator now doesn't change unless you're multiplying or dividing.