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23 Cards in this Set
- Front
- Back
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even+even=
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even
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odd+odd=
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even
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even+odd=
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odd
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even*even=
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even
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odd*odd=
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odd
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even*odd=
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even
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Prime Numbers up to 30
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2,3,5,7,11,13,17,19,23,29
1 Is not a prime number 2 Is the only even prime number |
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Divisibility
A number is divisible by 2 if.. |
its units digit is divisible by 2
10,592 is divisible by 2 because its units digit (2) is even. |
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Divisibility
An integer is divisible by 3 if... |
the sume of its digits is divisible by 3.
2,145 is divisible by 3 because 2+1+4+5=12 and 12/3 is 4 no remainder. |
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Divisibility
An integer is divisible by 4 if... |
its last two digits form a number thats divisible by 4.
94,203,012 is divisible by 4 because its last two digits (12) is divisible by 4. |
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Divsibility
An integer is divisible by 5 if... |
its units digit is either 0 or 5.
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Divisibility
An integer is divisible by 6 if.... |
its divisible by both 2 and 3.
Remember its divisible by 2 if its last digit is even. So numbers ending in 1,3,5,7,9 can not be divisible by 6. To be divisible by 3, its its digits must add up to a number divisible by 3. 99936 is divisible by 6 because 6 is even and 9+9+9+3+6= 36 which is divisible by 6. |
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Divisibility
An integer is divisible by 9 if |
the sum of its digits is divisible by 9.
90045 is divisible by 9 because 9+0+0+4+5=18 which is divisible by 9. |
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Formula for percentage increase/decrease?
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Percentage change = ((difference between new and original)/original )* 100
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(x^a)(y^a)
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(xy)^a
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Common Root
√1 |
1
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Common Root
√2 |
1.4
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Common Root
√3 |
1.7
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Common Root
√4 |
2
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Factored
x^2-y^2 |
Unfactored
(x+y)(x-y) |
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Factored
(x+y)^2 |
Unfactored
x^2+2xy+y^2 |
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Factored
(x-y)^2 |
Unfactored
X^2-2xy+y^2 |
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Common Pathogorean Triangles
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3-4-5
6-8-10 5-12-13 Or some multiple of them |
