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Grade 5

CCSS Math Standard: 5.OA.1

Write and interpret numerical expressions. Use parentheses, brackets, or braces in numerical expressions, and evaluate expressions with these symbols.

Parentheses: How big of a change can they make!?

Once students understand the order of operations, they often just get stuck doing increasingly difficult practice problems. That's a sure-fire way to squelch learning, though. Here, students determine where to place parentheses to make the greatest change in an expression.