math 7-8 vocabulary
Terms
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- natural #s
- {1, 2, 3 ...} counting #s
- whole
- natural #s and 0
- integers
-
whole #s & their opposites
{....-3,-2,-1,0,1,2,3.....} - rational
- any # that can be written in form of fraction
- irrational
- any # that can NOT be written in form of fraction
- real
- all irrational and rational #s
- What is the formula for area of a rectangle?
- A = L * W
- What is the formula for area of a triangle?
- A = 1/2 B * H
- Congruent
- All sides and angles are the same - same size, same shape
- Order of Operations
- PEMDAS - Parentheses, Exponents, Multiplication, Division, Addition, Subtraction
- proportion
-
equation that states 2 ratios (fractions) are equal
example 1/2=50/100 - expanded form
- 2,495 = 2,000 + 400 + 90 + 5
- mixed numbers
-
A number that consists of a whole number part and a fractional part.
Example: 1 1/3 - digits
- any one of the following ten numerical symbols: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9.
- origin
- (0,0)
- x-axis
- horizontal number line
- y-axis
- vertical number line
- ordered pair
- (x,y)
- terminating decimal
- A decimal with a finite number of digits.
- repeating decimal
- A decimal in which a digit or a set of digits repeat infinitely.
- range
- In statistics, the difference between the largest and smallest values in a sample.
- prime number
- A whole number greater than 1 whose only factors are 1 and itself.
- composite number
- A number exactly divisible by at least one whole number other than itself and 1.
- similarity
- Having the same shape, but not necessarily the same size.
- mode
- The number of element that occurs most frequently in a set of data.
- median
- The middle number in an ordered set of numbers.
- What is the formula for area of a circle?
- "Pi r squared"
- What is the formula for circumference of a circle?
- Pi x D
- Complementary angles
- Add up to 90 degrees
- supplementary angles
- Add up to 180 degrees
- probability
-
the number of chances
divided by
the number of choices - what are the factors of 15
- 1, 3, 5
- what are the multiples of 6
- 6, 12, 18, 24...