Cheat Sheet - Download as DOC by tamir13

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```									                                                 Cheat Sheet
(Make sure to draw your rulers and protractors)
(Also write down ABCD and ABCDE before hand to save time during the test)

3:4:5                                     45:45:90                                30:60:90
6 : 8 : 10                                Longest side: multiply by 2             Longest side is twice the shortest
9 : 12 : 15                                                                       side
Shortest side: divide by 2
5 : 12 : 13                                                                       Middle side is the shortest side
8 : 15 : 17                                                                       times 3

2              2
x + 2xy + y = (x + y)
2                    Even + Even =                            Even  Even =
2              2          2
Odd + Odd =                              Odd  Odd =
x – 2xy + y = (x – y)                              Even + Odd =                             Even  Odd =
2     2
x –y           = (x – y)(x + y)

       An integer is divisible by 2 if its units digit is divisible by 2
       An integer is divisible by 3 if the sum of its digits is divisible by 3.
       An integer is divisible by 4 if its last two digits form a number divisible by 4.
       An integer is divisible by 5 if its units digit is either 0 or 5.
       An integer is divisible by 6 if it is divisible by both 2 and 3.
       An integer is divisible by 9 if the sum of its digits is divisible by 9.
       An integer is divisible by 10 if its units digit is 0.

2  1 .4                                p1q1  p2q2  ptotal q1  q2            V  L W  H
3  1 .7
SA  2LW   2LH   2WH 
d  ( x2  x1 ) 2  ( y 2  y1 ) 2
I = prt
V = hr²
A=½bh
D=rt
1 1       1                                                                                 4
                                            2                                     V=      r³
t1 t 2 t total                              A= s 3                                          3
4
w1t1  wt
 2 2                                                                           S = 180(n – 2)
other other                                 A = r²
x   Length
difference                                  C = 2r                                       
100                                                                       360 Circum
original
A = bh

Verbal               5th               10th              15th             20th             25th
22min left      18                13              8                  4

Math                  5th               10th              15th             20th             23th
33min left      26                18              11                 7

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