# How do you evaluate 20(1/2 times35)?

Jul 3, 2016

$350$

#### Explanation:

Notice that the brackets are not necessary because the only operation is multiplication.

Dividing (cancelling) first is a GREAT idea, because it makes the numbers smaller.

$20 \times \frac{1}{2} \times 35 \text{ }$ gives ${\cancel{20}}^{10} \times \frac{1}{\cancel{2}} \times 35$

which is very convenient because multiplication by 10 is a breeze.

This can be seen to give 350.

This type of calculation can be done by inspection rather than having to write it out.