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# Fractions

## Law of fractions

(a / b) + (c / d) = (a d + b c) / (b d)                    (1)

(a / b) (c / d) = (a c) / (b d)                             (2)

(a / b) / (c / d) = (a / b) (d / c)                             (3)

(- a / b) = - (a / b) = a / (- b)                            (4)

[(a / b) + (c / d)] / [(e / f) + ( g / h)] = ([(a / b) + (c / d)] / [(e / f) + (g / h)]) ([b d f h] / [b d f h])

= [((a d) + (b c)) f h] / [((e h) + (f g)) b d]                   (5)

## Related Topics

• Mathematics - Mathematical rules and laws - numbers, areas, volumes, exponents, trigonometric functions and more

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## Citation

• Engineering ToolBox, (2018). Fractions. [online] Available at: https://www.engineeringtoolbox.com/fractions-d_2098.html [Accessed Day Mo. Year].

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