# Percent Change – Practice ProblemsHaving fun while studying, practice your skills by solving these exercises!

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To calculate how much percent changes, you can use the formula. The percent of change is equal to the change of percent divided by the original value, but sometimes it is hard to figure out what is the original value.

Ask yourself, what percent did the situation start with, and that will be the original value. Sometimes the percent increases and others there is a decrease, but the formula for percent of change remains the same. Why do we study percent of change? Well you know you will be tested on this topic and also, you can use this formula to figure out important things that affect your life.

For example, if the weatherman reports the chance of snow will decrease by 25% in the coming days, you might want use this information to decide if you should wear snow boots or your blue suede shoes. What about to help you decide whether or not to take an umbrella. Well yesterday, there was a 50% chance of rain, but today there is a 75% chance of rain. What is the percent of change? There is a 50% greater chance it will rain today than yesterday – don’t you want to know how to calculate that? Regardless, there is a 100% chance you will enjoy this video!

Analyze proportional relationships and use them to solve real-world and mathematical problems. CCSS.MATH.CONTENT.7.RP.A.1

Exercises in this Practice Problem
 Explain the difference between increase and decrease. Calculate the percent change. Identify the most successful posts. Estimate the percent of change left in each set of blocks. Decide which formula you need in order to calculate the percent change. Determine the percent change for each situation.