Sat Math

Front 1

Counting consecutive numbers

Back 1

subtract the two numbers and then add 1

Front 2

divisiblity of 9

Back 2

if the digis add up to a mulitple of 9 then its divisible by 9

ex 729, 135

Front 3

if it's an even number whose digits add up to a mulitple of 3, then it's divisible by 6

Back 3

ex: 96, 78

Front 4

percent increase/decrease formula

Back 4

amount of change/ original amount x 100

Front 5

equations for consecutive integers

Back 5

n (n+1) (n+2) (n+3)

Front 6

equations for consectuvie even integers

Back 6

n (n+2) (n+4)

Front 7

union and intersection

Back 7

union is the combining of more than 1 set

intersection is the overlapping elements of two sets

(for union count each number once)

Front 8

when dealing with averages what is important to remember

Back 8

there are 3 parts and with any 2 parts you can find the third

Average= sum of data/ number of data

Front 9

Average Rate Equation

Back 9

Average Rate= total distance/ (total time1+ total time 2)

Front 10

weighted averages

Back 10

weighted average= (total points accumulated)/(total tests taken)

Front 11

arithemetic sequences

Back 11

adding a common number between terms

Front 12

geometric sequences

Back 12

multipying a common number between terms

Front 13

what do you need to remember with scientific notation

Back 13

it can never be 16.2 x103
it has to be 1.62 x 10^4

Front 14

when 80% are right
or 4 out of 5 are correct

Back 14

20% are wrong
and 1 out of 5 is wrong

Front 15

what do you know about increase follwowed by decrase of same magnitude

Back 15

the result will always be a decrase

Front 16

increase followed by another percent increase

Back 16

they increase on each other (you don't just add them)