PEMDAS Exhibit - Learning Connections Essential Skills Mental Math - order of operations Write and interpret numerical expressions. Use parentheses, brackets, or braces in numerical expressions Evaluate expressions with these symbols. Directions Numbers are missing from the math museum. Use the order of operations to find the numbers and restore the PEMDAS Exhibit. Tap an operation symbol to simplify that part of the expression. If your expression contains an exponent, tap the exponent to simplify.