Add and subtract one- and two-digit numbers in real-world and mathematical problems.
Number & Operations
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Use the relationship between addition and subtraction to generate basic facts up to 20.
Demonstrate fluency with basic addition facts and related subtraction facts up to 20.
Estimate sums and differences up to 100.
Use strategies and algorithms based on knowledge of place value and equality to add and subtract two-digit numbers.
Solve real-world and mathematical addition and subtraction problems involving whole numbers up to 2 digits.