Developing Rate/Ratio/Proportion Middle School - Beyond the Introduction
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Uploaded by MathNotationsVids on May 11, 2010
A development for middle schoolers of a more challenging rate/ratio/proportion problem involving THREE quantities. The emphasis is on encouraging an intuitive grasp of the relationships between two of the quantities when the third is "controlled" or held constant. Appropriate for middle schoolers who have solved problems involving proportions.
After you view this, try the classic puzzle problem:
If a hen and a half can lay an egg and a half in a day and a half, how many eggs can six hens lay in six days!
Answer: 24 eggs
Your methods???
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This is a great, "mental math" type of method that I like!
MathMammoth 1 year ago