1. prime
   even
2. uneven
   decimal

The number seven is a prime number. A prime number is a number that is divisible only by the number one and itself.

1. border
   radius
2. circumference
   area

The perimeter of a circle is called a circumference. The radius is the line/distance from the center of the circle to the perimeter.

1. convex
   concave
2. both A and B
   neither A or B

Something that curves inward is concave. Something that curves outward is convex.

1. 3
   6
2. 9
   18

The square root of 9 is 3. 3x3=9

1. 12
   13
2. 144
   1,000

A gross is 144. 12 is the square root of 144, so a gross is 12 dozen.

1. yes
   no
2. maybe
   who cares

Pi cannot be written as a fraction. Did you know that there is a national pie/pi day?

1. 2
   5
2. 6
   8

Each horizontal line represents one inch. If we find the dots that are not located on the line, and count the lines between them and the line of best fit, we can determine how many are more than 4 inches different.

1. thousand
   hundred
2. multiple
   quadrillion

A quadrillion comes after a million, billion, trillion. A quintillion comes after a quadrillion.

1. 12
   24
2. 11
   2

8x3=24. This is a simple multiplication problem.

1. 1
   3
2. 6
   9

A represents 3. This is an algebraic multiplication problem.

1. yes
   no
2. maybe
   who cares

Yes, the opposite angles of a parallelogram are equal. Because the lines are parallel, the angles must be equal.

1. 31
   106
2. 143
   1069

87 + 56 = 143. This is a simple addition problem.

1. 3
   6
2. 9
   12

A nonogram has nine sides. Nono means nine.

1. concave
   convex
2. both A and B
   neither a or b

Something that curves outward is convex. Something that curves inward is concave.

1. yes
   no
2. maybe
   who cares

The number -3 is an integer. Integers can be negative numbers.

1. 11
   16
2. 63
   91

7 x 9 = 63. This is a simple multiplication problem.

1. true
2. false

This is false. In an isosceles triangle, two sides are equal.

1. median
   end
2. right
   left

In statistics, the middle value of an ordered set of values is called the median. Median is not the same as mean or average.

1. 4
   8
2. 12
   16

Four squared equals 16. Squaring a number means multiplying it by itself.

1. yes
   no
2. maybe
   who cares

-5 is not a natural number. Natural numbers can't be negative.

1. 0
   1
2. 6
   36

6 to the power of 0 equals 1. Any number to the power of 0 is 1.

1. 3
   5
2. 7
   9

The next prime number after 3 is 5. A prime number is a number that can only be divided by the number one and itself.

1. 3
   6
2. 9
   12

The square root of 81 is 9. 9x9=81

1. 10
   100
2. 1,000
   1

The Roman numeral "C" represents 100. The Roman numeral "V" represents 5.

1. 10
   10 squared
2. 100
   They are both the same.

They are both the same. Ten squared equals 100.

1. yes
   no
2. maybe
   who cares

Fractions cannot be integers. Integers are whole numbers, including negative numbers.

1. -20
   -10
2. 2
   20

Two is greater than -10. Positive numbers are always greater than negative numbers.

1. 4
   11
2. 88
   44

22 x 4 = 88. This is a simple multiplication problem.

1. 127
   112
2. 239
   596

239 - 127 = 112. This is a simple subtraction problem.

1. 45
   90
2. 180
   360

A right angle is 90 degrees. An acute angle is less than 90 degrees.

1. Algebra
   Geometry
2. Geography
   History

Algebra uses letters to represent numbers. Algebra is fun!

1. apex
   bell
2. circle
   square

A graph that indicates a normal distribution in probability and statistics is shaped like a bell. This is called a bell curve.

1. circumference
   perimeter
2. radius
   angle

Radius is the term for the distance between the center of a circle and the perimeter. The circumference is the distance around a circle.

1. ellipse
   square
2. rectangle
   triangle

A slightly flattened circle is called an ellipse. Ellipses were used as design elements in the Ford Taurus.

1. 2
   8
2. 12
   14

12 is the square root of 144. 12x12=144