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23 Cards in this Set
- Front
- Back
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radius
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The radius of a circle is the distance from it's center to it's edge: It is half of the circle's diameter
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estimate
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To calculate approximately (the amount, extent, magnitude, position, or value of something).
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absolute value
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The absolute value of a number is the positive value of that number. For a positive number, it is just the number. For a negative number it is it's positive value. So, the absolute value of 5 is 5, and the absolute value of -5 is 5 also. Absolute value is written like this:
| - 5 | = 5 with vertical bars around the number. You can think of absolute value as the distance from zero to your number. Now, here's a problem for you: What is | - 8 |? |
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decimal
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Decimal
A decimal number is a number with a decimal point in it, like these: 1.5; .6 ; 3.14 |
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fraction
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A fraction is a number between zero and 1 and is expressed as one number over another number, like this:
1/2. The number on top is called the numerator and the number on the bottom is called the denominator. It means that if you cut up a whole into 2 parts (the denominator), then the fraction is 1 of those 2 parts, or a half |
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exponet
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An exponent is a small number written with another big number that tells how many times to multiply the big number by itself.
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integer
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An integer is a positive whole number (like 1, 2, 3 .. ),
a negative whole number (like -1, -2, -3 ... ), or zero. It is not a decimal number, or a fraction. |
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equation
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An equation is a math sentence that says that 2 things are equal. An equation always has an equal (=) sign. The thing or things that are on the left side of the equal sign are equal to the things on the right side of the equal sign. Here are a few equations: X = Y + 5,
A = B - 4; Z= 3 A In the first equation, if Y is 2, then X must be 2 + 5 or 7 to make the equation true. In the second equation, if B is 10, then A must be 6 to make the equation true. In the third equation, the number next to the letter means multiply the value of the variable represented by "A" by 3. So if A is 4, then Z must be 12 to make the third equation true. |
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vertex
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A vertex of a figure is a corner. The plural of vertex is vertices.
For example, a triangle has 3 vertices. |
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parallel
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Two lines in a plane are parallel if they never cross:
The opposite sides of a square are parallel. |
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congruent
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Two figures are congruent if they are the same size and shape. They can be mirror images of each other, or turned in any direction relative to each other.
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digit
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A digit is a single whole number (0 to 9) in a number 10 or larger. For example, the number 432 has 3 digits. Each digit has a place value. In the number 432, the 2 is the number of ones in the number.
The 3 is the number of 10's in the number, and the 4 is the number of 100's in the number. So you can add them up, like this: 4 X 100 = 400 3 X 10 = 30 2 X 1 = 2 --- 432 |
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denominator
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The denominator is the bottom part of a fraction. For example, in the fraction 3/4, the denominator is 4.
The number on the top is called the numerator. The denominator is the number of parts that you cut something into. For example, if you cut a pizza into 4 pieces (the denominator), and you get 3 pieces (the numerator), then you got 3/4 of the pizza. |
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area
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The area of a flat, or plane figure is the number of unit squares that can be contained within it. The unit square is usually some standard unit, like a square meter, a square foot, or a square inch. So, if you are trying to find the area of a sheet of paper that is 9 inches by 11 inches, and the unit square you want is the square inch, then there are 9 X 11 = 99 square inches in that sheet of paper. In this 4 inch by 3 inch rectangle,
each little square is a square inch. Count the little one-inch squares and find the total area. Is it the same as multiplying the width of the rectangle by the height? |
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perfect square
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A perfect square is a number that has an whole number square root. For example, 25 is a perfect square, because is 5, a whole number.
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concentric
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Concentric means having the same center. Two circles which have the same center are concentric:
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angle
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An angle is formed when 2 lines meet or cross each other.
Angles are measured in degrees. A right angle: is 90 degrees. |
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numerator
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The numerator is the top part of a fraction. For example, in the fraction 3/4, the numerator is 3.
The number on the bottom is called the denominator. This is the number of parts out of the total number of parts that your fraction has. For example, if you cut a pizza into 4 pieces, and you get 3 (the numerator), then you got 3/4 of the pizza. |
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complementary angles
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Two angles are said to be complementary if their sum is 90 degrees. This makes them add up to a right angle. In a right triangle, the 2 angles other than the right angle are complementary because they add up to 90 degrees. (All the angles of a triangle add up to 180 degrees).
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consecutive
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Consecutive means "one after another", or "in a row". So ...
The first 4 consecutive numbers are 1,2,3, and 4. The first 4 consecutive odd numbers are 1,3,5, and 7. |
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factor
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To factor a number means to break it up into numbers that can be multiplied together to get the original number. Examples: 6 = 3 x 2 so, factors of 6 are 3 and 2.
9 = 3 x 3 so, factors of 9 are 3 and 3 |
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factorial
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A number factorial means to multiply that number by all the whole numbers below it. It is written with a exclamation (!) mark after it, like this: 5!, and means:
5! = 5 x 4 x 3 x 2 x 1 = 120 6! = 6 x 5 x 4 x 3 x 2 x 1 = 720 |
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arithmetic Sequence
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An arithmetic sequence is one in which the same number is added or subtracted from each element to get the next element in the sequence.
2, 4, 6, 8, 10, ... is an arithmetic sequence |
