Virginia SOL 2.CE.1

What students need to be able to do

• Apply strategies (e.g., rounding, compatible numbers) to estimate solutions for single-step addition or subtraction problems.
• Apply strategies (e.g., concrete models, place value, properties of addition) to determine the sum or difference of two whole numbers up to 100.
• Represent, solve, and justify solutions to single-step and multistep contextual problems involving addition or subtraction of whole numbers up to 100.
• Demonstrate fluency with addition and subtraction within 20 by applying reasoning strategies (e.g., doubles, near doubles, make-a-ten).
• Recall with automaticity addition and subtraction facts within 20.
• Use patterns, models, and strategies to make generalizations about algebraic properties for fluency.
• Determine the missing number in an equation with addition and subtraction within 20.
• Use inverse relationships to write all related facts connected to a given addition or subtraction fact model within 20.
• Describe the not equal symbol as representing a relationship where expressions on either side represent different values and justify reasoning.