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23 Cards in this Set

  • Front
  • Back
even+even=
even
odd+odd=
even
even+odd=
odd
even*even=
even
odd*odd=
odd
even*odd=
even
Prime Numbers up to 30
2,3,5,7,11,13,17,19,23,29

1 Is not a prime number
2 Is the only even prime number
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.
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.
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.
Divsibility
An integer is divisible by 5 if...
its units digit is either 0 or 5.
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.
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.
Formula for percentage increase/decrease?
Percentage change = ((difference between new and original)/original )* 100
(x^a)(y^a)
(xy)^a
Common Root
√1
1
Common Root
√2
1.4
Common Root
√3
1.7
Common Root
√4
2
Factored

x^2-y^2
Unfactored

(x+y)(x-y)
Factored

(x+y)^2
Unfactored

x^2+2xy+y^2
Factored

(x-y)^2
Unfactored

X^2-2xy+y^2
Common Pathogorean Triangles
3-4-5
6-8-10
5-12-13

Or some multiple of them