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Chapter 9- Algebra using multiplication and division facts Expression- part of a number sentence that has numbers and operation signs but does not have an equal sign 7+4 x+4 Variable- a letter that can stand for any number Example x+8=13 x=5 Equation- a number sentence that shows two amounts are equal. 7=3+4 12=12 6+7=10+3 Order of operations- Rules for performing operations in expressions that have more than one operation Please Excuse My Dear Aunt sally Parenthesis ( ) Exponents Multiplication X Division ÷ Add subtract + -