Proportional number line comparison with missing value.
Number line diagram showing a proportional relationship between two scales, with values 0, 4, and 10 on the top line corresponding to 0, 18, and an unknown value on the bottom line.
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Number line diagram showing a proportional relationship between two scales, with values 0, 4, and 10 on the top line corresponding to 0, 18, and an unknown value on the bottom line.
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