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学生说明
Can you solve the equation? Use the clues in the first three equations, to find the solution to the last equation. Be careful. Pay close attention to the details. Keep the order of operations in mind.
教师备注（学生不可见）
Snowflake = 10 Pair of mittens = 4, Single mitten = 2 Pair of skates = 2, Single skate = 1 10 + 10 + 10 = 30 10 + 4 + 4 = 18 4 - 2 = 2 1 + (10 x 2) = 21 <--Order of operations says multiplication before addition
