Solving Proportions Without Cross-Multiplying
Students solve equations of the form A/B = C/D by doing the same thing to both sides of the equation, such as multiplying both sides by an appropriate value. They apply a previously learned concept in a new situation instead of learning a trick.
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Hair & Nails: How Fast Do They Grow?
Find here a complete lesson dealing with the equations and graphs of proportional relationships, as well as what each individual point on such a graph represents. It may appeal to girls in particular, as the data details the growth rates...
6th - 8th Math CCSS: Designed
Calculate Percent of a Number Using a Proportion Model
The Common Core is all about ratios and proportions, and this video uses that method to calculate percents. This is the second video in a series that organizes information from an ice cream poll into a proportion to find how many vanilla...
6 mins 6th - 8th Math CCSS: Designed
How Do You Determine if Two Ratios are Proportional Using Cross Products?
Are these two given ratios proportional? One quick and easy way to answer this question is to cross multiply the two values. If the products are equal then they are proportional ratios. If they are not equal then they are not...
2 mins 6th - 9th Math