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## Chapter 18 Proportional Reasoning

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**Kristina Sims**Chapter 18Proportional Reasoning**At the park, there are 24 children playing and 20 of them**are wearing blue jeans. The remaining children playing are not wearing blue jeans. • If I say “For every five children that are wearing blue jeans, there is one not wearing blue jeans.” • This statement shows an additive/multiplicative relationship.**At the park, there are 24 children playing and 20 of them**are wearing blue jeans. The remaining children playing are not wearing blue jeans. • If I say, “There are 16 more children wearing blue jeans than children not wearing blue jeans.” • This statement shows an additive/multiplicativerelationship.**I am a good way to organize information and I show how two**variable quantities are related. What am I?**The ratio of green marbles in the bag to the total number of**marbles in the bag. • This is what type of ratio?**This is developed through activities involving comparing and**determining the equivalence of ratios and solving proportions in a wide variety of problem-based contexts and situations without recourse to rules or formulas…**Instead of first introducing algorithms, teachers should**encourage these…**A ratio of two measures in the same setting is a**_____________ ratio.**A ______________ ratio is a ratio of two corresponding**measures in different situations.**The ratio of the number of yellow marbles to the number of**orange marbles in the bag. • What type of ratio is this?**36:4**• 27:3 • These are ______________ _________.