__Calculation of Numbers:__
The common
number system in use is Decimal number system. In this system we use ten
symbols each representing a digit. These are 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9.

For example,
the number 12972235, we read it as: One crore twenty nine lakh seventy two
thousand two hundred and thirty five.

It is represented
as shown below:

In the above
number,

The place
value of 8 is (5 × 10°) = 5

The place
value of 9 is (3 × 10

^{1}) = 30
The place
value of 6 is (2 × 10²) = 200 and so on.

__Note: for billion and Trillion__
There are
1000 millions in a billion

There are
1000 billions in a trillion

That means
there are 1000 × 1000 or 1 million millions in a trillion

Therefore,

10,00,000 is
one million

100,00,00,000
is one billion

1000,00,00,00,000
is one trillion

__Calculation of Length and Weight:__
The Length
and weighting system is divided into the given sequence

Millimeter (mm), Centimeter (cm), Decimeter, meter (m), decameter, hectometer, kilometer (km)

Here,

10 mm = 1 cm

10 cm = 1
decimeter

10 decimeter = 1 m

10 m = 1
decameter

10 decameter = 1 hectometer

10
hectometer = 1 km

Therefore,

(10 × 10 ×
10) mm = 1000 mm = 1 m,

(10 × 10) cm
= 100 cm = 1 m,

(10 × 10 ×
10 × 10 × 10 × 10) mm = 1000000 mm = 1 km

(10 × 10 ×
10 × 10 × 10) cm = 100000 cm = 1 km

(10 × 10 ×
10) m = 1000 m = 1 km and so on.

**The weighting system is also like the length system, just instead of meter, it will be gram. So the weighting sequence will be**

__Note:__
Milligram,
centigram, decigram, gram, decagram, hectogram and kilogram

In SI unit
system i.e. in MKS system, the length is measured in meter (m), weight is
measured in kilogram (k) and time is taken as second (s).

So, the
table bellow shows the SI unit system standard multipliers

For example:

(10 × 10 ×
10) gram = 1000 gram = 10

^{3}gram= 1 kilogram, or, 1 kg = 10^{−3}gram

__Calculation of computer data storage:__
The basic
unit used in computer data storage is called a bit. 8 Bits is equal to 1 Byte.

Bit: A Bit is a value of either a 0 or
1.

Byte: 1 Byte = 8 Bits

Kilobyte (KB): 1 KB = 8,192 Bits,

1 KB = 1,024 Bytes

Megabyte (MB), 1 MB =1024 KB

Gigabyte (GB), 1 GB = 1024 MB

Terabyte (TB), 1 TB = 1024 GB

Petabyte (PB), 1 PB = 1024 TB

Exabyte (EB), 1 EB = 1024 PB

Zettabyte (ZB), 1 ZB = 1024 EB

Byte: 1 Byte = 8 Bits

Kilobyte (KB): 1 KB = 8,192 Bits,

1 KB = 1,024 Bytes

Megabyte (MB), 1 MB =1024 KB

Gigabyte (GB), 1 GB = 1024 MB

Terabyte (TB), 1 TB = 1024 GB

Petabyte (PB), 1 PB = 1024 TB

Exabyte (EB), 1 EB = 1024 PB

Zettabyte (ZB), 1 ZB = 1024 EB

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