WA.3.1. Core Content: Addition, subtraction, and place value (Numbers, Operations) Students solidify and formalize important concepts and skills related to addition and subtraction. In particular, students extend critical concepts of the base ten number system to include large numbers, they formalize procedures for adding and subtracting large numbers, and they apply these procedures in new contexts.
3.1.A. Read, write, compare, order, and represent numbers to 10,000 using numbers, words, and symbols.