2-Digit Addition Concepts

solve one-step and multi-step word problems involving addition and subtraction within 1, 000 using a variety of strategies based on place value, including algorithms.[4C]
generate and solve problem situations for a given mathematical number sentence involving addition and subtraction of whole numbers within 1, 000.[4D]
recall basic facts to add and subtract within 20 with automaticity.[4A]
add up to four two-digit numbers and subtract two-digit numbers using mental strategies and algorithms based on knowledge of place value and properties of operations.[4B]
represent and solve addition and subtraction word problems where unknowns may be any one of the terms in the problem.[7C]
represent whole numbers as distances from any given location on a number line.[9C]