[FT] AMPLIFY 6.6.02: Write Expressions Where Letters Stand for Numbers

Students begin their journey to formally cross the threshold from arithmetic to algebra! They write expressions that record operations with numbers and with letters (now defined as variables), which stand in for unknown numbers and can take on many values (MP8). They connect stories relating two quantities using expressions, and identify what quantity the variable represents (MP2).

By Zach Wissner-Gross