Addition and Subtraction

4NR2: Using part-whole strategies, solve problems involving addition and subtraction through the hundred-thousands place, as well as multiplication and division of multi-digit whole numbers presented in real-life, mathematical situations.

4NR2.1: Fluently add and subtract multi-digit numbers to solve practical, mathematical problems using place value understanding, properties or operations, and relationships between operations.

4NR.2.5: SOlve multi-step problems using addition, subtraction, multiplication, and division involving whole numbers. Use mental computation and estimation strategies to justify the reasonableness of solutions.