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7th Grade Math Review
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Gravity
Terms in this set (27)
Natural Numbers
All numbers in the sequence {1,2,3...}
Whole Numbers
All numbers in the sequence {0,1,2...}
Integers
All numbers in the sequence {...-2,-1,0,1,2...}
Rational Numbers
A number that can be expressed as a fraction
Irrational Numbers
A number that cannot be written as a fraction. The decimal form doesn't terminate or repeat
PAEMDAS
Order of operations
Commutative Property
Example 7+3+1 = 3+1+7
Associative Property
Example (4+5) + 9 = 4 + (5+9)
Distributive Property
Example 2(3+1) = 2(3) + 2(1)
Identity Property of Zero
Example 7 + 0 = 7
Identity Property of One
Example 5x1 = 5
Additive Inverse
Example -6 + 6 = 0
Multiplicative Inverse
Example 6/8 x 8/6 = 1
Line
Set of points that extend forever in both directions
Line segment
Part of a line with two endpoints
Ray
Line that extends in one direction and has one endpoint
Parallel
Lines that never intersect and are the same difference from each other
Acute angle
Less than 90 degrees
Right angle
90 degrees
Obtuse Angle
Greater than 90 degrees, less than 180 degrees
Straight Angle
180 degrees
Reflex Angle
Greater than 180 degrees less than 360 degrees
Complementary Angles
Their sum is 90 degrees
Supplementary Angles
Their sum is 180 degrees
1/2h(b1+b2)
Formula for area of trapezoid
1/2bh
Formula for area of triangle
bh
Formula for area of parallelogram
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