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First class - Number
Standard 1.NS.1.4a - Compare subtraction equations to find the related fact with numbers up to 1000.
Operations - Addition • develop an understanding of addition by combining or partitioning sets, use concrete materials 0-20 • explore, develop and apply the commutative, associative and zero properties of addition • develop and/or recall mental strategies for addition facts within 20 • construct number sentences and number stories; solve problems involving addition within 20 • add numbers without and with renaming within 99 • explore and discuss repeated addition and group counting