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SFUSD Mathematics Core Curriculum Development Project

Work with numbers 11-19 to gain a foundation for place value 1. Compose and decompose numbers 11-19 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 10 ones and 1, 2,3,4,5,6,7,8 or 9 ones.