2.1.2: Demonstrate mastery of addition and subtraction basic facts; add and subtract one- and two-digit numbers in real-world and mathematical problems.

Demonstrate mastery of addition and subtraction basic facts; add and subtract one- and two-digit numbers in real-world and mathematical problems.

2.1.2.1Use strategies to generate addition and subtraction facts including making tens, fact families, doubles plus or minus one, counting on, counting back, and the commutative and associative properties. Use the relationship between addition and subtraction to generate basic facts.2.1.2.2Demonstrate fluency with basic addition facts and related subtraction facts.2.1.2.3Estimate sums and differences up to 100.2.1.2.4Use mental strategies and algorithms based on knowledge of place value and equality to add and subtract two-digit numbers. Strategies may include decomposition, expanded notation, and partial sums and differences.2.1.2.5Solve real-world and mathematical addition and subtraction problems involving whole numbers with up to 2 digits.2.1.2.6Use addition and subtraction to create and obtain information from tables, bar graphs and tally charts.
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