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Using Double Numberlines for Ratios - One atta Time

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Use the double numberline to solve the problem.
A sloppy joe restaurant gave 2 napkins for every 9 items ordered. If someone bought 81 items, how many napkins should they get?
item napkins 0 9 18 27 36 45 54 63 72 81 0 2 4 6 8 10 12 14 16 18
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