# How do you translate "one-hundred times a number K decreased by twenty" into a mathematical expression?

Dec 29, 2015

$100 \cdot K - 20$

#### Explanation:

Let we divide the expression in two parts

(i) One hundred times a number K
(ii) decreased by twenty

(i)
One hundred means 100, times means "multiplied by" $\cdot$ a number K means the number is K.
That means one hundred multiplied by K.
$\implies 100 \cdot K$

(ii) decreased means subtracted $-$ by twenty means $20$
$\implies - 20$

So the full expression becomes $100 \cdot K - 20$.