Double Number Lines

​Double Number Lines

​A double number line is a model made up of two number lines used together to represent the ratio between two quantities. The intervals on each number line maintain the same ratio.

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One pound of bananas costs $0.50. Determine the cost for 2 pounds of bananas.

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The width of a rectangle is 8 feet, and its length is 20 feet. What will be the length if the width is 2 feet?

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The width of a rectangle is 8 feet, and its length is 20 feet. What will be the length if the width is 14 feet?

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Amanda is packaging beads. For every 9 striped beads, she includes 21 solid beads. How many striped beads do you need if there are 7 solid beads?

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Amanda is packaging beads. For every 9 striped beads, she includes 21 solid beads. How many striped beads do you need if there are 35 solid beads?