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Perimeter Area The distance around a 2-dimensional shape. The perimeter of the figure below is 20 (3+3+7+7) The amount of space inside the boundary of a flat (2dimensional) object such as a triangle or circle. The size of a surface. The figures below all have an area of 9. Distributive Property Distribute The property that says multiplying a number by a group of numbers added together is the same as doing each multiplication separately Give shares of something; deal out Commutative Property Associative Property The property that says you can swap numbers around and still get the same answer when you add. Or when you multiply. The property that states that it doesn't matter how you group numbers when you multiply (or when you add) Order of Operations Operations Evaluate Parentheses To calculate the value of. The familiar ( ) symbols used in pairs to group things together. A mathematical process. The rules of which The most common are add, calculation comes first in subtract, multiply and divide (+, -, ×, ÷ ). an expression.