1. Name _______________________________________Date _________________________<br />Mrs. Labuski / Mrs. Rooney Period _____Lesson 1-5 Mental Math (Properties)<br />VocabularyDefinition ExampleCommutativePropertyAssociativePropertyDistributivePropertyIdentity Property of ZeroIdentity Property of OneProperty of Zero<br />Name _______________________________________Date _________________________<br />Mrs. Labuski / Mrs. Rooney Period ________Lesson 1-5 Mental Math (Properties)<br />VocabularyDefinition ExampleCommutativeProperty(Ordering)You can add or multiply numbers in any order18 + 9 = 9 + 1815 x 2 = 2 x 15AssociativeProperty(Grouping)When you are only adding or only multiplying, you can group any of the numbers together.(17+2)+9=17+(2+9)(12x2)x4=12x(2x4)DistributivePropertyMultiply each number in the parenthesis by the number on the outside and then add6 x (10 + 4)6 x 10 + 6 x 460 + 2484Identity Property of Zero(addition)The sum of any number and zero is equal to the number(addition)9 + 0 = 9Identity Property of One(multiplication)The product of any number and one is equal to the number. (multiplication) 5 x 1 = 5Property of Zero(multiplication)The product of any number and zero is zero.7 x 0 = 0<br />