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2013-7thMathPTVocab2

SHMS 7th Grade Math Powertime Vocab 2

TermDefinition
Algebraic expression An expression consisting of at least one variable and also consists of numbers and operations. Example 2x + 3
Term A number, a variable, or a product of a number and variable.
Coefficient The number part of a term that includes a variable. For example, 3 in the term 3x.
Constant A quantity having a fixed value that does not change or vary, such as a number. For example, 5 in the expression x + 5.
Equation A mathematical sentence formed by setting two expressions equal. Example 2x + 1 = 5
Inequality A mathematical sentence formed by placing an inequality symbol between two expressions. a + 5 < 10
Fraction A number expressed in the form a/b where a is a whole number and b is a positive whole number.
Multiplicative inverse Two numbers whose product is 1. Example 2 and 1/2 because 2 x (1/2) = 1
Percent of change A rate of change expressed as a percent. This is found by finding the amount of change and dividing by the original amount. Example: if a population grows from 50 to 55 in a year, it grows by 5/50 = 10% per year.
Ratio a comparison of two numbers using division.
Proportion An equation stating that two ratios are equivalent.
Scale factor A ratio between two sets of measurements.
Percent error The difference between the actual and predicted amounts divided by the actual amount
Created by: hbogue