Work with addition and subtraction equations.
Operations and Algebraic Thinking
Work with addition and subtraction equations.
Operations and Algebraic Thinking
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Understand the meaning of the equal sign, and determine if equations involving addition and subtraction are true or false.
Determine the unknown whole number in an addition or subtraction equation relating three whole numbers.
Represent addition and subtraction with objects, fingers, mental images, drawings, sounds (e.g., claps), acting out situations, verbal explanations, expressions, or equations.
Add and subtract within 20.
Fluently add and subtract within 20 using mental strategies. By end of Grade 2, know from memory all sums of two one-digit numbers.
Decompose numbers less than or equal to 10 into pairs in more than one way, e.g., by using objects or drawings, and record each decomposition by a drawing or equation (e.g., 5 = 2 + 3 and 5 = 4 + 1).
For any number from 1 to 9, find the number that makes 10 when added to the given number, e.g., by using objects or drawings, and record the answer with a drawing or equation.
Work with addition and subtraction equations.
Work with addition and subtraction equations.
Work with addition and subtraction equations.