Share the Headline Story with the class. Encourage students to draw logical conclusions about the weights.
Maryn has a balance scale and six weights: 1, 1, 3, 3, 9, and 9 ounces.
She can measure any weight that is a whole number of ounces up to 26 ounces (1 pound 10 ounces). We can make a chart to show which weights she should use to measure each amount. What weights can she measure without using the two lightest weights?