# How do you simplify 28 ÷ 4 • 3?

Apr 20, 2017

21

#### Explanation:

In BIDMAS, Division comes first so you divide first and then multiply.

$\frac{28}{4}$ = 7

$7 \cdot 3$ = 21

Apr 20, 2017

$\frac{28 \times 3}{4} = 21$

#### Explanation:

Multiplication and division have the same priority, so it should make no difference which is done first.

However there is still an element of ambiguity because the $\div$ sign could indicate division of everything following.

This is a good example of the importance of showing exactly what is meant.

$28 \div 4 \times 3$ would be written as $\frac{28 \times 3}{4} = 21$

$28 \div \left(4 \times 3\right)$ would be written as $\frac{28}{4 \times 3} = \frac{7}{3} = 2 \frac{1}{3}$

My leaning would be towards the first one.