## Thinking Mathematically (6th Edition)

First, we can divide the decrease by the original amount to get a decimal number. We then express this decimal number as a percent. To express a decimal number as a percent, we move the decimal point two places to the right and attach the percentage sign. For example: The amount decreases from 10 to 6. We can see that the original amount decreased by 4. $\frac{decrease}{original ~amount} = \frac{4}{10} = 0.4 = 40\%$ The percent decrease is 40%
It is quite simple to find percent decrease. First, we can divide the decrease by the original amount to get a decimal number. We then express this decimal number as a percent. To express a decimal number as a percent, we move the decimal point two places to the right and attach the percentage sign. For example: The amount decreases from 10 to 6. We can see that the original amount decreased by 4. $\frac{decrease}{original ~amount} = \frac{4}{10} = 0.4 = 40\%$ The percent decrease is 40%