Objective: Interpret two-digit numbers as either tens and some ones or as all ones.
Lesson 3 allows students to explore two-digit numbers as tens and ones, and as just ones. Students use their fingers to represent “bundled” tens and “unbundled” ones by clasping and unclasping their fingers. For example, students model 34 with 3 students showing their hands clasped to make a ten, and a fourth student showing 4 fingers to represent 4 ones.
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