Math Vocabulary Flashcards
UNIT 1: NUMBERS CARD 1
Composite Number
12 = 3 × 4 (More than 1 factor pair)
A whole number with more than 1 factor pair.
UNIT 1: NUMBERS CARD 2
Factor Pair
Factors of 20
1 2 4 5 10 20
Example Pair: 5 × 4 = 20
A pair of whole numbers that multiply to result in that number. For example, 5 and 4 are a factor pair of 20.
UNIT 1: NUMBERS CARD 3
Multiple
Multiples of 3
3 6 9 12 15 18
3 × 6 = 18
The result of multiplying that number by a whole number. 18 is a multiple of 3, because it is 3 × 6.
UNIT 1: NUMBERS CARD 4
Prime Number
7 Only Factor Pair: 1 × 7
A whole number greater than 1 that has exactly one factor pair: the number itself and 1.
UNIT 2: FRACTIONS CARD 5
Common Denominator
1
4
&
5
4
Same bottom number
The same denominator in two or more fractions. For instance, 1/4 and 5/4 have a common denominator.
UNIT 2: FRACTIONS CARD 6
Denominator
3
4
4 equal parts
The bottom part of a fraction that tells how many equal parts the whole was partitioned into.
UNIT 2: FRACTIONS CARD 7
Equivalent Fractions
1 / 2
2 / 4
Same Size, Same Point
Fractions that have the same size and describe the same point on the number line. For example, 1/2 and 2/4 are equivalent.
UNIT 2: FRACTIONS CARD 8
Numerator
3
4
3 parts shaded
The top part of a fraction that tells how many of the equal parts are being described.
UNIT 3: MIXED NUMBERS CARD 9
Mixed Number
2
1
3
A number expressed as a whole number and a fraction less than 1. (e.g., 2 1/3).
UNIT 4: DECIMALS CARD 10
Decimal Notation
3
10
➔ 0.3
25
100
➔ 0.25
A way to write tenths, hundredths, and other decimal fractions as numerals with digits and a decimal point.
UNIT 4: DECIMALS CARD 11
Expanded Form
482
⬇
400 + 80 + 2
A way of writing a number as a sum of the values of the digits (e.g., 482 as 400 + 80 + 2).
UNIT 4: DECIMALS CARD 12
Round
180 182 185 190
182 rounds down to 180!
To say which number a given number is closer to (nearest ten, hundred, etc.).
UNIT 4: DECIMALS CARD 13
Standard Algorithm
1
H T O
4 5 6
+ 2 8 9
7 4 5
A step-by-step method to add or subtract vertically by place value, composing or decomposing units.
UNIT 6: DIVISION CARD 14
Dividend
37 ÷ 5 = 7 R 2
The Number Being Divided
The number that is being split or divided into groups. In 37 ÷ 5, the dividend is 37.
UNIT 6: DIVISION CARD 15
Divisor
37 ÷ 5 = 7 R 2
Dividing By This Number
The number we divide by, representing group size or group count. In 37 ÷ 5, the divisor is 5.
UNIT 6: DIVISION CARD 16
Quotient
37 ÷ 5 = 7 R 2
The Result of Division
The whole number result of dividing one number by another. In 37 ÷ 5, the quotient is 7.
UNIT 6: DIVISION CARD 17
Remainder
37 ÷ 5 = 7 R 2
Left Over:
The number left over when we take away as many equal groups as we can from a number.
UNIT 7: GEOMETRY CARD 18
Acute Angle
< 90°
An angle that measures less than 90 degrees. It is small, sharp, and "acute".
UNIT 7: GEOMETRY CARD 19
Angle
Ray 1 Ray 2
A figure made up of two rays that share the same endpoint (called the vertex).
UNIT 7: GEOMETRY CARD 20
Degree
1° = 1 / 360 of a Circle
A unit of rotation used to measure angles. Each degree is exactly 1/360 of a full circle.
UNIT 7: GEOMETRY CARD 21
Intersecting Lines
Crossing Point
Lines that cross or meet at exactly one shared point.
UNIT 7: GEOMETRY CARD 22
Line
Never Ends (Both Directions)
A straight arrangement of points that extends infinitely in both opposite directions.
UNIT 7: GEOMETRY CARD 23
Line Segment
Endpoint Endpoint
A part of a line with exactly 2 endpoints and all of the points in between them.
UNIT 7: GEOMETRY CARD 24
Obtuse Angle
> 90°
An angle that measures greater than 90 degrees but less than 180 degrees.
UNIT 7: GEOMETRY CARD 25
Parallel Lines
Never Cross
Lines in the same plane that go in the exact same direction and never intersect.
UNIT 7: GEOMETRY CARD 26
Perpendicular Lines
90°
Lines that intersect or cross each other to create perfect 90-degree right angles.
UNIT 7: GEOMETRY CARD 27
Point
Point A
A specific, exact location along a line or in a coordinate space.
UNIT 7: GEOMETRY CARD 28
Ray
Endpoint Continues
A line that ends at exactly one point and goes on infinitely in the other direction.
UNIT 7: GEOMETRY CARD 29
Right Angle
90°
An angle that measures exactly 90 degrees, forming a perfect square corner.
UNIT 7: GEOMETRY CARD 30
Straight Angle
180°
An angle that measures exactly 180 degrees, forming a perfect straight line.
UNIT 7: GEOMETRY CARD 31
Vertex
VERTEX
The exact point where two rays or sides meet to form a corner.
UNIT 8: SHAPES CARD 32
Line of Symmetry
Fold Line
A line that divides a shape into two identical halves that match up exactly when folded.
UNIT 8: SHAPES CARD 33
Quadrilateral
4 SIDES
A flat, 2D polygon with exactly 4 straight sides and 4 corners/angles.
UNIT 8: SHAPES CARD 34
Rectangle
A quadrilateral with 2 pairs of parallel sides and 4 right angles (90°).
UNIT 8: SHAPES CARD 35
Rhombus
4 EQUAL SIDES
A quadrilateral with 4 equal straight sides. Opposite sides are parallel.
UNIT 8: SHAPES CARD 36
Right Triangle
90°
A triangle that contains exactly one interior 90-degree right angle.
UNIT 8: SHAPES CARD 37
Square
A special quadrilateral with 4 equal straight sides and 4 right angles (90°).
UNIT 8: SHAPES CARD 38
Symmetry
SIDE A SIDE B A matches B
A property of a figure if its parts match up exactly when the figure is folded or rotated.
UNIT 8: SHAPES CARD 39
Triangle
3 SIDES
A flat, 2D polygon with exactly 3 straight sides and 3 interior angles.
UNIT ______ CARD 40
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