Proportions
Proportions
Standard
6.M.3 Solve problems involving proportional relationships and units of measurement, e.g., same system unit conversions, scale models, maps, and speed.
Cluster
C16
Vocabulary
Proportion- an equation you write to show that two ratios are equivalent
Cross Products- Where you multiply the numerator of each ratio by the denominator of the other ratio
Objective
To write, solve and identify proportions by using cross products.
Lesson
Checking a Proportion
3/5 = 12/18 To check to see if the proportions are equivalent, you multiply the 3 times 18= 54 and 5 times 12= 60, because the products are not equal the proportion is not equal.
Solving Proportions
30/12 = ?/18 To find th missing piece, you would multiply to numerator and denominator that you know, then divide the product my the other number. 30 x 18 =540 -:- 12 = 45 so the missing numerator is 45
Practice
If you need more practice, please use the Online Tutorial that is used with our Text Book
Click on Learn the Lesson
