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Math Vocabulary

5th Grade Math Vocabulary (1st Semester)

TermDefinition
fraction A number that compares part of a number with the whole.
denominator The bottom number in a fraction; it tells how many parts there are in the whole.
numerator The top number in a fraction. It describes a number of parts out of the total number of parts.
whole number Zero together with all the counting numbers (ex: 0, 1, 2, 3, 4, 5...)
decimal number A number containing a decimal point.
decimal point A symbol that separates a decimal fraction of a number from a whole number.
perimeter The distance around a closed shape, or the length of its boundary.
area The amount of surface or the size of a surface.
acute angle An angle that measures less than 90 degrees.
obtuse angle An angle that measure more than 90 degrees.
straight angle An angle that measures exactly 180 degrees.
right angle An angle that measures exactly 90 degrees.
parallelogram A quadrilateral with two pairs of parallel sides.
trapezoid A quadrilateral with exactly one pair of parallel sides.
quadrilateral A polygon with exactly four sides.
sum The answer to an addition problem.
difference The answer to a subtraction problem.
product The answer to a multiplication problem.
quotient The answer to a division problem.
factor All the whole numbers that can be divided exactly into a given number.
multiple A multiple of a given number is any number into which it will divide evenly.
least common multiple The smallest common multiple between two or more numbers.
greatest common factor The largest common factor between two or more numbers.
prime number A number with exactly two factors (one and itself).
composite number A number with more than two factors.
place value The value of each digit in a number depends on its place or the position in that number.
GEMDAS Rules for evaluating (or solving) mathematical expressions.
equation A statement that two quantities are equal. There must be an equal sign.
expression A mathematical statement without an equal sign.
origin The point where the x and y axis meet on a coordinate plane
common denominator For two or more fractions, a number that is a common multiple of the denominators.
equivalent Having the same value, or the same amount.
equivalent fractions Fractions that are the same amount.
estimate A rough approximate calculation. A number that has not been calculated accurately.
even number A number that is divisible by two.
polygon A plane shape which has three or more straight sides.
triangle A polygon with three sides and three angles.
rhombus A parallelogram with four equal sides. Opposite angles are equal.
Created by: amanda.day
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