User Guide – SAT Made Easy
Topic 
Description 
Correct 
Incorrect 



1)
General usage of the TI89/Voyage200 
a)
Multiplication of variables b)
Enter .5 instead of ˝ to obtain decimal answers. c)
Roots: i.e. ^{3}√x d)
Denominators e) Squaring sin(x) f)
Attention to parentheses: g)
Euler Number h)
Parentheses 
x*y^2, x*cos(x) use ˝*x or .5*x x^(1/3) 1/(x2) sin(x)^2 I.e. ln(sin(5x))/(x^21) (x^29)/(3+x^2) 
xy^2, xcos(x) 3√x 1/x2 sin(x^2)
(x^29)/3+x^2 



2)
General usage of CME 
a) Use
ESC to exit the current module or SATME altogether. b)
Incorrect Entries – see above  yield the error message: “Invalid Entry”.
Press ENTER and correct expression. c) To force
decimal answers, use decimal input (see also 1b) d)
Provide 100,000 bytes of RAM and 150,000 of Flash ROM (to check:2^{nd} 6). Deleting or archiving files may be
necessary: use 2^{nd} “–“ (VARLINK), F4 to
select files, then F1 to delete or archive. Archiving might be a good way to
manage programs, variables, etc as a loss of battery power may delete any unarchived files. e) When
using SATME, its program files are temporarily placed in the MAIN folder.
Thus, empty MAIN folder when starting SATME to prevent any file reoccurrences
(and thus loading error). f)
Should SAT Made Easy not start (anymore) or act strange, reset ALL memory (2^{nd}
6, then F1) as memory may be corrupted.
g) Use
the latest Operating System (OS) using TI Connect. 








TOPIC 
Correct Usage: 
Corresponding
screen shots 
Incorrect Usage: 

F1: ALGEBRA 




5) 1: Compute any expression without variables. 
1) (17*(4))*(12*15) 

1) [17*(4)]*[12*15] – only use parentheses, do not use brackets. 






6) 2: Solve any Equation or Inequality 
1) Solve x3 = 5 for the variable x. This yields x=2. Optional: Restrict the interval i.e. for periodic functions
(i.e. sin(x) ) 

1) Solve x3 = 5 for the variable y .
The variable you solve for must be part of the equation. 











7) Solve any 2x2 system. 
x+y=2 This yields x=1 and
y=1 . 








8) Simplify expressions with or without variables. 
(17+(4))+(12+15) Yields 18 













9) Compute Powers and read its
Rules. 
Compute x^2 * x^5
yields x^7 by the 2. rule. 








10) Compute or Simplify Roots 
(SQRT(3)+SQRT(5))/ (SQRT(3)SQRT(5))
yields 3SQRT(15)+SQRT(15)5 = 2 













11) Factor expressions or numbers 
x^2 + 5x + 6 factors
into (x+3) * (x+2) Or: factor 99 =
3*3*11 













12) Expand expressions 














13) Find Common Denominator 
Ex 1/x + 1/y = y/xy + x/xy = (x+y)/(xy) 








14) Simplify Fractions 
What is 4 + (3/8)/2
+ 5/6 ? = 4 + 3/16 + 40/48 =
4 + 9/48 + 40/48 = 4 + 49/48 = 4 +
48/48 + 1/48 = 5 + 1/48 








15) 




16) 




17) 




18) 




19) 




F3: Statistics. 




1: Average, Median, Mode 
Enter
numbers separated by commas in a list. Ex:
{3,18,27} 

1) 43, 76 2) {34+54} 3) [34,54] 4) (34,54) 







The
Average of 3, 18 and 27 is 16, median is 18, and there is no mode. 










6) Weighted Average 
Enter
both numbers and weights in lists, separated by commas. Ex Numbers={3,18,27} Weights={100, 200, 300} Then,
the weighted average is (100*3+200*18+300*27)/(100+200+300)
= 20 . Thus, the average of 100 3’s , 200 18’s and 300 27’s is 20 

1) 43, 76 2) {34+54} 







7)
Ratios 
If we have n=150
juniors and m=700 seniors , the ratio Juniors to
Seniors is n:m = 150:700 or 3:14. 








The ratio n:(n+m) =Juniors to Students is 3:17. The ratio m:(n+m) =Seniors to Students is 14:17. 
The ratio m:n
=Seniors to Juniors is 700:150 or 14:3. 










8)
Percentages 





This module deals
with percentages, their conversions to fractions, % increases, discounts,
etc 









What is 32/16 as a
percentage? 




Since 32/16 = 2 , we
have 2*100% = 200% 









Here, convert from %
to fractions. 




Ex: 2000% is what as
a fraction? 




2000/100 = 20 / 1 = 20
. 









What is 10% of 50?
Correct, it is 5. So, enter x=10 and n is 50 .
Voila. 




What is 92% of 5000?





92% of say $5000 is
$4600 , the remaining 8% of $5000 are thus $400
. 









Here, we compute a
percentage of a percentage. 




What is 80% of 300%
of $10000 ? 




300% of $10000 (or
3*$10000) = $30000 , and 80% of $30000 is $24000. 









NBA Stats: The
Lakers won 25 out of 160 matches. 




We enter m=25 and
n=160 




To learn that Laker’s winning % is only 15.625%. 









If the Lakers win 52
and lose 125 matches 




Then enter m=52 and
n=125 




To learn that their
winning record is 29.379% 









Discount(1) . If you bought some pants for at a discount
(x%=22.12%) for $79.90, then what was the original sale price? 




Enter x%=22.12% and
n=$79.90 . 




The pants were originally $102.59 









Discount(2) finds the discounted value of a car that is for sale.





You got lucky, you
will only have to pay %75 of $2500 (the original car value) 




So, just pay $1875 and save $625.










If we get add to pay
late fee of %8.88 on the $3000 credit card bill 




We enter x%=8.88 and
n=3000 




To find the increase
to be $266.40 for a total of $3266.40 









If a laptop cost
$1000 after a whopping 225.9% increase 




We enter x%=225.9
and n=1000 




to learn that the original laptop value was $306.84 only. 










9)
Rates 










If we walk i.e.
2.985 miles (=Δy) in 700 hours (=Δx) then the rate at which we are moving is 0.004
mph. 



















If we drive at
55.25 mph for 34.9 hours 




We will cover
1928.225 miles. 














If we drive 10000
miles at 25.5 mph 




It will take us
392.157 hours. 














If John can eat 7
candies per hour and Jim eats 24 per hour. They eat for 83 hours 




Their total number
of candies consumed is 2573 . 


























































