FDP Flashcards
1/6
.1667
16.67%
5/8
.625
62.5%
1/7
.14
14%
1/9
.11
11%
3/8
.375
37.5%
5/6
.833
83.3%
1/11
.09
9%
7/4
1.75
7/8
.875
87.5%
1/25
.04
4%
1/8
.125
12.5%
1/50
.02
2%
9/11
.09*9=.81
4/7
.14*4<- NO ONLY WORKS FOR 1/11 OR 1/9
1/125
.008
0.8%
fractions with decimals
Make sure denom is whole number, move dec in numerator
comparing fractions
can cross multiply!
quick calc of 5%
find 10%, then divide by 2
12% –> 10% + 1% + 1%
interest formula
P(1+r/n)^(n/t), n is how many times compounded
- total increase with compounding is just a little bit more so answer choice shouldn’t be drastically different unless you compound for longer period of time
when trying to find 70% of something as the end goal
no need to go to 100% first, use:
current amount / final amount - x = current % / 70%
if A increases by x% and B decreases by x% what’s the net change?
since x is the same for both, and if A>B then overall increase
2 eq and 2 var for ratios
you need 3 var and 2 eq to figure out ratio
If you see the denom is 9, 99, 999 etc
numerator tells you the repeating digit so
27/99=.272727
terminating decimals has only prime numbers 2, 5 –> don’t forget
to reduce
Tens digit - don’t forget to use
10x+y
To get reciprocal of fraction
if both sides are in fraction and no + / - then just flip fraction
If answer choice asks for %
multiply by 100 so it’s easier to visualize
