Describe the relationship among the four terms of pairs of equal ratios
What will be an ideal response?
Complete answers will include the follow information. When given several pairs of equal ratios, children should be able to discover the relationship among the four terms and be able to discover that the cross-products of equal fractions are equal. Children should also be able to explain why this relationship holds. Computing cross products provides a simple test for determining whether two ratios (or fractions) are equal. If three of the four terms in a proportion are given, the fourth can be found by using the cross-product relationship.
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A conventional type might be drawn to these types of majors:
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