PERMUTATIONS & COMBINATIONS Rank of the word or Dictionary order of the English words like COMPUTER, COLLEGE, SUCCESS, SOCCER, RAIN, FATHER, etc. Dictionary Rank of a Word Method of finding the Rank (Dictionary Order) of the word “R A I N” Given word: R A I N Total letters = 4 Letters in alphabetical order: A, I, N, R No. of words formed starting with A = 3! = 6 No. of words formed starting with I = 3! = 6 No. of words formed starting with N = 3! = 6 After N there is R which is required R  Required A  Required I  Required N  Required RAIN  1 word RANK OF THE WORD “R A I N” A….. = 3! = 6 I……. = 3! = 6 N….. = 3! = 6 R…A…I…N = 1 word 6 6 6 1 TOTAL 19 Rank of “R A I N” is 19 Method of finding the Rank (Dictionary Order) of the word “F A T H E R” Given word is : "F A T H E R" In alphabetical order: A, E, F, H, R, T Words beginni
Important Unit Conversion in Mathematics
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Unit conversion table in mathematics, important units and their conversion in mathematics.Changing between units of measurement,Roman numerals into Hindu arabic, prime numbers from 1 to 120
IMPORTANT UNITS CONVERSION
IN MATHEMATICS
10mm (millimeter)

1cm


10cm(centimeter)

1dm


10dm(Decimeter)

1m


10m (Meter)

1 Dam


10Dam (Decameter)

1 Hm


10 Hm (Hectometer)

1Km ( Kilometer)


1 Are (a)

100 m^{2}
^{}


1 Hectare(Ha)

10000 m^{2}
^{}


100 Ares

1 Hectare


100 Hectares

1 Km^{2}
^{}


1 KM

1000 m

100000 cm

1 cm^{3}

1 ml (millilitre) = 1/1000 Litres

1 dm^{3}

1 l (litre)

1 m^{3}

1 Kl (Kilolotre) = 1000 Litres

1 Score

20 Pieces

1 Ream

500 Pages Or 25 Score

1 Quire

24 Pieces

1 Pound

454 gm = About 0.5 Kg

1 Mile

1.6 Km

1 Inch

2.54 cm

12 Inch

1 Foot = 30 cm

36 Inches

1 Yard

3 Feet

1 Yard

1760 Yard

1 mile

1metre

39 Inches or 100 cm

a Km/h

(a x 5/18 ) m/s

a m/s

(a x 18/5) Km/h

1 Gallon

4.5 Litres

Formula for inter conversion of Celsius scale, Fahrenheit
Scale and Reaumur Scale


\[\frac{F32}{9}=\frac{C}{4}=\frac{R}{4}\] 
60 Seconds

1Minute

60 Minutes

1 Hour

24 Hour

1 day

7 days

1 week

About 4 weeks

1 month

12 months

1 year

10 year

1 decade

100 years

1 century

1000 years

1 millennium

Acute Angle

Angle between 0^{o} and 90^{o}
^{}

Right Angle

Angle of 90^{o}
^{}

Obtuse Angle

Angle Between 90^{o} and 108^{o}
^{}

Straight Angle

Angle of 180^{o}
^{}

Reflex Angle

Angle between 180^{o} and
360^{o}
^{}

Complete angle

360^{o}
^{}

Nano

10^{9}m

Micro

10^{6} m

Milli

10^{3}
^{}

Centi

10^{2} m

Deci

10^{1} m

All conversion into Base units
Metre,


Deka(Da)

10 m

Hecto

100 m

Kilo

10^{3 }m

Mega

10^{6 }m^{ }
^{}

Giga

10^{9 }m
^{}

Tera

10^{12 }m
^{}

Quantity 
Units 
Distance,
Displacement, Perimeter, Circumference 
mm, cm, dm,
m, da, 
Curved surface
Area, Total Surface Area 
mm^{2},
cm^{2}, dm^{2}, m^{2}, are, hectare 
Volume, Capacity 
mm^{3},
cm^{3}, dm^{3} or litre, m^{3} or Kilolitre 
Time 
Second,
minute, hour, day, month, year 
Money 
Paise,
Rupees 
ROMAN NUMERALS INTO HINDU ARABIC 

Roman Numerals 
Hindu Arabic 
Roman Numerals 
Hindu Arabic 
I 
1 
CL 
150 
II 
2 
CC 
200 
III 
3 
CCL 
250 
IV 
4 
CCC 
300 
V 
5 
CD 
400 
VI 
6 
D 
500 
VII 
7 
DL 
550 
VIII 
8 
DC 
600 
IX 
9 
DCC 
700 
X 
10 
DCCC 
800 
XX 
20 
CM 
900 
XXX 
30 
M 
1000 
XL 
40 
MC 
1100 
L 
50 
MD 
1500 
LX 
60 
MM 
2000 
LXX 
70 
MMM 
3000 
LXXX 
80 


XC 
90 


C 
100 

List of Prime Numbers From 1 to 120 

2 
23 
59 
97 
3 
29 
61 
101 
5 
31 
67 
103 
7 
37 
71 
107 
11 
41 
73 
109 
13 
43 
79 
113 
17 
47 
83 
119 
19 
53 
89 
Note:There are 10 prime numbers from 1 to 30
There are 25 prime numbers from 1 to 100
OLD INDIAN
SYSTEM OF NUMERATION FOR MONEY


4 दमड़ी

1 पैसा

4 पैसे

1 आना = 3
पाई

16 आने

1 रुपये

OLD INDIAN
SYSTEM OF NUMERATION FOR WEIGHT


8 रति

1 मासा

12 मासे

1 तोला

5 तोले

1 छटांक

40 सेर

1 मण
= 16 किलोग्राम

2.5 सेर

1 किलोग्राम

1 बटी
= 5 सेर

2 किलोग्राम

1 धडी
= 10 सेर

4 किलोग्राम

PRESENT SYSTEM OF NUMERATION FOR WEIGHT


1 Gram

1000 milligram

1 Decagram

10 Gram

1 Hectogram

100 Gram

1 Kilogram

1000 Gram

1 Quintal

100 Kg

1 Metric Ton

1000 Kg

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