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# Butler Gr. 3 PSSA M1

### Math Vocabulary Practice/Group 1

TermDefinition
Acute angle An angle with a measure less than 90 degrees
Area The measure, in square units, of the inside of a plane figure.
Array A rectangular arrangement of objects in equal rows or columns
Congruent Having the same size and shape. Congruent angles have the same measure. Congruent segments have the same length.
Edge The line segment where two faces of a solid figure meet.
Equivalent Having the same value.
Face A plane figure that serves as one side of a solid figure
Fact family A set of related addition and subtraction, or multiplication and divison equations using the same numbers (eg. 6+9=15, 15-9=6, 9+6=15, 15-6=9)
Factor A whole number that divides evenly into another whole number (eg. 1, 3, 5 and 15 are factors of 15)
Line A straight path extending in both directions with no endpoints.
Line of symmetry A line that divides a figure into two halves that are mirror images of each other.
Line segment A part of a line with two endpoints.
Mean (average) The number found by dividing the sum of a set of numbers by the number of addends.
Median The middle number in an ordered set of data, or the average of the two middle numbers when the set has two middle numbers
Mode The number(s) that occurs most often in a set of data.
Created by: ldurns