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Understanding Proportions Notes

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Understanding Proportions Notes

Read the notes, then answer each question. Use cross-products to test whether two ratios form a proportion.

Proportion Basics

A ratio compares two values, such as 3:5 or 3/5. A proportion is an equation stating that two ratios are equivalent. For instance, 3/4 = 6/8 is a proportion because both ratios have the same value.

1.Which statement best describes a proportion?
  • An equation showing that two ratios are equivalent
  • A comparison of three or more quantities
  • A multiplication problem with equal factors
  • A ratio with a missing number
2.Complete the statement using the wording from the notes: A ratio compares two .

Testing Ratios with Cross-Multiplication

To test whether a/b = c/d, compare the cross-products a × d and b × c. If they are equal, the ratios form a proportion.

3.For 2/3 = 4/6, find both cross-products and decide whether the equation is a proportion.
4.Do 5/8 and 15/24 form a proportion? Show the two cross-products and state your conclusion.
5.Which pair of ratios forms a proportion?
  • 2/7 and 4/14
  • 3/8 and 9/20
  • 5/6 and 10/18
  • 4/9 and 8/27
6.A drink recipe uses 3 scoops of mix for every 5 cups of water. How many scoops are needed for 15 cups of water to keep the same ratio? Write a proportion and solve.
7.Create a real-world situation that can be represented by the proportion 2/3 = 8/12. Explain what each ratio compares.
8.Write a pair of equivalent ratios and verify that they form a proportion by showing their cross-products.

2 printable pages

  • Understanding Proportions Notes, page 1 of 2: Proportion Basics, Testing Ratios with Cross-Multiplication

    Page 1

  • Understanding Proportions Notes, page 2 of 2: 6. A drink recipe uses 3 scoops of mix for every 5 cups of water. How many scoops are…

    Page 2

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