Ratios & Proportional Relationships

End of Year Project - Allison Dobyns

My Standard

7.RP.A.3: Using proportional relationships to solve real-world mathematical problems.


Use proportional relationships to solve multistep ratio and percent problems. Examples: simple interest, tax, markups and markdowns, gratuities and commissions, fees, percent increase and decrease, percent error.

What is a proportional relationship?

Definition: A relationship between two equal ratios.


Example: Apples are sold in groups of seven for three dollars. Therefore the ratio would be 7 to 3 (or 7:3).

Examples

Questions

Question 1

The ratio of the number of adults to the number of children at a concert is 5 to 3. If there is a total of 120 people at the concert, how many children are there?


A) 45

B) 48

C) 72

D) 75


How to work it out: https://docs.google.com/a/students.mgsd.k12.nc.us/presentation/d/1sruzkiu-UcicZmDsP5MlMoZ8DVTbbLoai_oIA8wIvH0/edit?usp=sharing

Question 2

The school office orders boxes of pencils and boxes of pens in a ratio of 5 to 2. If 60 boxes of pencils are ordered, how many boxes of pens should be ordered.


A) 12

B) 14

C) 24

D) 57


How to work it out: https://docs.google.com/a/students.mgsd.k12.nc.us/presentation/d/18l-vL9oRw-bRAWDfH8bhbNCGZQ-bcKAZLNeU7HmmQo0/edit?usp=sharing

Question 3

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