Join Vince Kotchian for an in-depth discussion in this video Working with percents, part of Everyday Math Fundamentals.
In this movie, I'll explain how to calculate…percent changes and also how to…calculate multiple discounts.…So, percent change might be a situation…like figuring out the percent change…in temperature from one day to another.…So, let's say today's high temperature,…let's say it was 75 degrees,…and let's say the high temperature yesterday was…65 degrees and you wanted to…figure out what is the percent change…in temperature from yesterday to today.…
The easy way to do this is to remember a formula,…and the formula is the difference…between the two amounts…divided by the original times 100.…So, let's see how this would work.…The difference between 75 and 65 is 10 degrees.…The original is 65 because yesterday it was 65.…That's where it started.…If we do that in our calculator,…10 divided by 65 is equal to approximately 0.15.…
The final step is multiplying by 100,…so if we do that, 0.15 times 100,…we're going to get about 15%.…So, the percent change from yesterday to today…is just 15%.…The next thing I want to show you with percent change…
- Practicing mental math
- Understanding decimals and fractions
- Working with percentages and ratios
- Solving equations
- Calculating area and volume
- Scaling recipes
- Estimating your running speed
- Calculating the area for home-improvement projects
- Working with probability
Skill Level Appropriate for all
1. Math Foundations: Part one
2. Math Foundations: Part Two
3. Math Foundations: Part Three
4. Shopping and Cooking Math
5. Health and Fitness Math
6. Home-Improvement Math
7. Probability and Counting Math
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