Quant - Fractions, Decimals & Percents

Front 1

Digits & Decimals

Back 1

A & B are both 2 digit nos. If A & B contain the same digits, but in reverse order, what integer must be a factor of A+B

10x+y+10y+x=11(x+y)

Rounding to decimal only when >=5

Front 2

FRACTIONS

Back 2

Increasing the numerator & denorminator by the same value brings fraction closer to 1

1/2 < 2/3 <11/12 <1011/1012 ~= 1

Front 3

Add/Subtract mixed nos

Add

7 1/3 =7 2/6
4 1/2 =4 3/6
=11 5/6

7 1/3 = 7 2/6 = 6 8/6
-4 1/2 = 4 3/6 = 4 3/6
=2 5/6

Back 3

Multiplying 2 proper fractions always reduces their value

Diviing 2 proper fractions always increase their value

Front 4

When comparing fractions, cross multiply

7/9 4/5
35<36
4/5 > 7/9

Back 4

Benchmark vaues

127/255 < 162/320
<1/2 >1/2

Front 5

PERCENTS

Back 5

10% of x, just move the decimal point left by 1

Front 6

Simple Interest

PxRXT

T in yrs, convert R into decimal

Back 6

Compound Interest

P(1+r/n)^nt

r rate in decimal, n no of times in yr, t is no of yrs

Front 7

FDP

Back 7

1/50 - 0.02 - 2%
1/25- 0.04 - 4%
1/20 - 0.05 - 5%

Front 8

1/5 = 0.2 = 20%
2/5 = 0.4 = 40%
3/5 = 0.6 = 60%

Back 8

1/4 = 0.25 =25%
5/4 = 1.25 = 125%

Front 9

3/10 = 0.3 = 30%
7/10 = 0.7 = 70%

Back 9

1/3= 0.33 = 33%
2/3=0.66=66%
4/3=1.3~=133#

Front 10

1/8 = 0.125 = 12.5%
1/6 = 0.16 = 16.6%

Back 10

3/2 = 1.5 ~= 150%