The question came up on a homeschool math forum:
“My first grader and I were playing with equivalent expressions. We were trying to see how many ways we could write the value ‘3.’
“He wrote down 10 – 2 × 3 + 1.
“When I tried to explain the problem with his calculation, he got frustrated and didn’t want to do math.
“How can I help him understand order of operations?”
[If you think this sounds like too complex of a math expression for a first grader, you may want to read my blog post about math manipulatives and big ideas.]
Order of operations doesn’t matter in this instance. What matters is communication.
The mother didn’t know how to read what her son wrote.
He could help her understand by putting parentheses around the part he wanted her to read first.
He doesn’t need to know abstract rules for arbitrary calculations, or all the different ways we might possibly misunderstand each other. He just needs to know how to say what is in his mind.
Denise Gaskins' Let's Play Math 
