Compose and decompose numbers from 11 to 19 into ten ones and some further ones, e.g., by using objects or drawings, and record each composition or decomposition by a drawing or equation (e.g., 18=10 + 8); understand that these numbers are composed of ten ones and one, two, three, four, five, six, seven, eight, or nine ones
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Fill in the Blank
Have students share the different ways they determined the answer. After several strategies are shared have students discuss which strategy was the most efficient for them.