Basic Arithmetic : Decrease
Study concepts, example questions & explanations for Basic Arithmetic
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Example Questions
Example Question #3 : Percents And Decimals
In March, an athlete weighed 
The formula to find percentage change is
So for our athlete, our new weight is 170 pounds, and the original weight is 195 pounds.
Because the question already tells us that we need to find the percent lost, or percent decrease, we can drop the negative sign in the answer.
Example Question #4 : Percents And Decimals
Last month the shirt you wanted to buy cost 
1. Subtract the lower price from the higher price.
2. Divide the difference or amount of change by the initial price:
or 10% price decrease
Example Question #5 : Percents And Decimals
We first find 18% of 76:
Since 76 is being decreased by this amount, we subtract 13.68:
Example Question #4 : Finding Percent Change
At age 
The questions throws a lot of numbers at us, but the only ones we are concerned with are those having to do with height. We use the following formula:
We want to know the percent change. We know the amount change, 6 inches, and the original amount, 52 inches. Plugging these into the formula, we get:
Rounding this number to the nearest tenth gives us 11.5%.
Example Question #6 : Percents And Decimals
Percent change is found by the following formula:
Amount change is the difference between the old amount and the new amount.
Here, the original amount is 30, and the new amount is 27. The difference between them is:
We plug in 3 for amount change and 30 for original amount and simplify:
Our final answer is 10%.
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