# How do you rewrite the expression 5/6=?/18?

Jun 17, 2018

$15$

#### Explanation:

We get
$\frac{5 \cdot 3}{6 \cdot 3} = \frac{15}{18}$

Jun 17, 2018

The unknown value became $15$

#### Explanation:

The trick hear is to realise that if you multiply by 1 you do not change the value. Example: $6 \times 1 = 6$

But 1 comes in many forms. So we can change the way something looks without changing its intrinsic value.

color(green)(5/6color(red)(xx1) color(white)("d") ->color(white)("d") 5/6color(red)(xx3/3)color(white)("d") =color(white)("d") (5xx3)/(6xx3)color(white)("d") =color(white)("d") 15/18