Goal: Think like a mathematician! Identify quantities and relationships in problem situations.
Together, Evan, Katie, and McKenna had $865 when they left to go shopping. Evan spent 2/5 of his money. Katie spent $40. McKenna spent twice as much as Evan. They each have the same amount of money left.
Source: Kelemanik, Lucenta, Janssen Creighton, Routines for Reasoning Fostering the Mathematical Practice in All Students, Portsmouth, NH: Heinemann, 2016
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