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Maria told Patrick that her quarter weighs less than what a nickel weighs because 0.2 has fewer digits than 0.18. How can Patrick show Maria 0.2 is greater than 0.18?
He must explain that you have to compare the place values, not the number of digits. In the tenths place, 2 > 1, so 0.2 is greater than 0.18.
He also could create a place values chart or hundredths chart.