How do you add or subtract $\frac{3 x}{10} + \frac{9 x}{10}$ $(3x)/10+(9x)/10$ ?

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How do you add or subtract $\frac{3 x}{10} + \frac{9 x}{10}$ $(3x)/10+(9x)/10$ ?

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Answer 1 · 2015-05-30T14:22:05

Your fractions have the same DENOMINATORS so you can add directly the numerators (maintaining the common denominator) as:
$\frac{3 x}{10} + \frac{9 x}{10} = \frac{3 x + 9 x}{10} = \frac{12 x}{10} =$ $(3x)/10+(9x)/10=(3x+9x)/10=(12x)/10=$ (dividing the numbers by 2):
$= \frac{6}{5} x$ $=6/5x$

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How do you add or subtract $\frac{3 x}{10} + \frac{9 x}{10}$ $(3x)/10+(9x)/10$ ?

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How do you add or subtract $\frac{3 x}{10} + \frac{9 x}{10}$ $(3x)/10+(9x)/10$ ?