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19 Cards in this Set
- Front
- Back
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Divisible by 3
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Add up the digits of the number, if that sum is divisible by 3, then the number is divisible by 3.
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Divisible by 5
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A number is divisible by 5 if it ends in 5 or 0
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Divisible by 9
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A number is divisible by 9 if the sum of its digits is divisible by 9
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Divisible by 10
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If a number ends in 0 it is divisible by 10
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Prime number
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If a number is only divisible by 1 and itself and has no other factors (therefore having only 2 factors), it is a prime number
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Composite number
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If a number has more than two factors, it is a composite number.
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Vertical angles
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are formed when two lines intersect. These angles are equal.
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Adjacent angles
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are two angles with a common vertex and a common side, but no common interior points.
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Right angles
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is an angle whose measure is 90
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Acute angle
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is an angle whose measure is larger than 0 but less than 90
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Obtuse angle
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is an angle whose measure is larger than 90 but less than 180
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straight angle
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is an angle whose measure is 180. Such an angle is, in fact, a straight line.
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reflex angle
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is an angle whose measure is greater than 180 but less than 360
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complementary angles
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are two angles, the sum of the measures of which equals 90
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supplementary angles
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are two angles, the sum of the measures of which equals 180
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congruent angles
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are angles of equal measure.
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Isosceles
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a triangle having at least two equal sides is called isosceles triangle.
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Obtuse triangle
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a triangle with an obtuse angle (greater than 90) is called an obtuse angle
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Acute angle
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an acute angle is a triangle with three acute angles (less than 90)
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