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23 Cards in this Set

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 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