Students are beginning to use number lines to solve problems about time. 3.MD.1 Students understand time as a continuous measurement through exploration with stopwatches and use the number line, a continuous measurement model, as a tool for counting intervals of minutes within 1 hour (). Students see that an analog clock is a portion of the number line shaped into a circle. They use both the number line and clock to represent addition and subtraction problems involving intervals of minutes within 1 hour (3.MD.1).
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