Join Vince Kotchian for an in-depth discussion in this video Comparing prices of different-sized products, part of Learning Everyday Math.
- Okay in this movie I'm gonna show you…a couple of different ways that you can use…to calculate which size of a product…is less expensive per ounce or per pound.…So this might come in handy if you're shopping at a store…and you're comparing two sizes.…I know the larger size is usually less expensive per unit,…but just so you can check and see how they arrived…at their number if there is one.…So, let's say you're shopping for yogurt at a grocery store.…I'll draw a couple of pictures for ya.…
Okay so the first way,…and the way that you're usually gonna do this,…is try to figure out what is the price per ounce…for each size of yogurt?…So if they don't already tell you at the store,…this is what you're gonna do.…You can take out your calculator,…and just divide the total price by the number of ounces,…and that'll give you the price per ounce.…So we would divide $2.99 by 12,…we would divide $3.69 by 16.…So I'm gonna take out my calculator so we can…check that math.…
Okay so if I put these numbers in my calculator,…$2.99 divided by 12...…
- 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 Intermediate
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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