Question

estimate the answer of 80% of 160. and explain how you got your answer.

Answer 1

160 / 2 = 80. therefore 80 is 50% of 160. 80 / 2 = 40. 40+80 = 120. which is close to the exact answer of 125.

Answer 2

err 128 i mean

Answer 3

there might be a better way though...

Answer 4

\[ \begin{align}
\frac{80}{100} &= \frac{x}{160} \qquad \text{"Cross multiply", or multiply both sides by 160*100.}\\ \\
100x &= 12800 \\
x &= 128
\end{align} \]