Percent Change

A percent is a ratio out of 100. 34% is 34 out of 100.

To write a percent as a fraction, write the number as the numerator over denominator 100, and then simplify. For example, 34% is [ggfrac]34/100[/ggfrac] or [ggfrac]17/50[/ggfrac]. To write a percent as a decimal, divide the number by 100. 34% = 0.34.

I change the percent to a decimal then multiply by the whole. 34% of 50 is 0.34 × 50 = 14.

percent = [ggfrac]part/whole[/ggfrac]. First, write a ratio of [ggfrac]part/whole[/ggfrac], and then divide to write it as a decimal. Multiply by 100 to write the value as a percent.

percent = [ggfrac]part/whole[/ggfrac], so whole = [ggfrac]part/percent[/ggfrac]. Write the percent as decimal, and then divide the part by the decimal to get the value of the whole.

I can look for keywords such as "more" or context-based words like “tax” or ”tip” to identify when the value is increasing. I can look for keywords such as "less" or context-based words like "discount" or "sale" to identify when the value is decreasing.

First, I calculate the part that represents the percent increase by multiplying the percent by the initial amount. Then, I add that amount to the original amount.

First, I calculate the part that represents the percent decrease by multiplying the percent by the initial amount. Then, I subtract that amount from the original amount.

First I subtract to find the difference between the original and increased amounts. Then I divide by the original amount to find the percent change as a decimal. Multiply by 100 to write it as a percent.

It is the same process as for an increased amount. First I subtract to find the difference between the original and decreased amounts. Then I divide by the original amount to find the percent change as a decimal. Multiply by 100 to write it as a percent.