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Math Vocabulary
Words from NJ-ASK3
20
Mathematics
3rd Grade
04/23/2010

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Cards

Term
addend
Definition
a number being added to one or more numbers
Term
sum
Definition
the answer in an addition equation
Term
difference
Definition
a number being added to one or more numbers
Term
polygon
Definition
closed plane figure where all sides are line segments. The name of a polygon describes how many sides it has (pentagon, hexagon, octagon.)
Term
perimeter
Definition
the measurement around the outside of a flat shape; for a polygon, the sum of the length of all the sides
Term
area
Definition
the number of square units (or square inches or square cm) needed to cover a flat space
Term
volume
Definition
the total amount of space inside a solid figure; measured in cubic units, cubic inches or cubic cm
Term
numerator
Definition
the top number in a fraction
Term
denominator
Definition
the bottom number in a fraction
Term
factor
Definition
a number that is multiplied to find a product
Term
product
Definition
the answer in an multiplication equation
Term
flip
Definition
a mirror image of a figure; a reflection of the first image
Term
slide
Definition
the movement of a shape without turning or flipping; a translation
Term
turn
Definition
the movement of a figure around a point; a rotation
Term
commutative property
Definition
changing the order of the numbers does not change the answer. (2 + 3 = 5 and 3 + 2 = 5… 4 x 7 = 28 and 7 x 4 = 28)
Term
line of symmetry
Definition
folding here would allow both halves of a figure to match up perfectly; the two halves are congruent
Term
acute angle
Definition
an angle that is less than a 90 degree right angle
Term
obtuse angle
Definition
an angle that is more than a 90 degree right angle
Term
right angle
Definition
a 90 degree angle that forms a perfect square
Term
digit
Definition
any of the symbols 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9 used to write numbers.
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