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Unit 1 Operational and Rational Numbers
Lesson 2
5
Mathematics
7th Grade
06/27/2017

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Term
additive inverses
Definition
Two numbers whose sum is 0 are additive inverses of one another. Example: 3/4 and
– 3/4 are additive inverses of one another because 3/4 + (– 3/4) = (– 3/4) + 3/4 = 0.
Term
associative property of addition
Definition
A property for addition that means you can add three numbers in any order and get the same result; EX: 1+(2+3) = (1+2)+3; (3x4)x2 = 3(4x2); (a + b) + c = a + (b + c).
Term
commutative property of addition
Definition
A property for addition that means you can add two numbers in any order and get the same result; EX: 50+25=25+50 and 3x4=4x3; a + b = b + a.
Term
opposite numbers
Definition
Two different numbers that have the same absolute value. Example: 4 and – 4 are opposite numbers because both have an absolute value of 4.
Term
zero pair
Definition
a pair of numbers whose sum equals zero. One number in this equation will always have a positive sign, while the other number will always have a negative sign.
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