Larger Numbers in Practice Video Lecture - Class 6

hello friends this video on
understanding numbers part 9 is brought
to you by exam for your calm no more
fear from exam so now that we learn how
to handle bigger numbers now let us look
at some applications of larger numbers
that how do we make use or where do we
use such huge numbers now there are
certain sectors where we often make use
of such larger numbers for example when
we talk about the population of a city
forget about the population of a country
or the population of the entire world
even if you talk about the population of
a small locality you see that turn out
to be in thousands or in lakhs when you
talk about something in finance money
matters you buy something you save
something you buy the house you buy a
car you do some savings in your band so
you talk about huge numbers you talk
about something like five lakhs 50 lakhs
you talk about huge numbers you talk
about sales in a shop that ok how many
bundles of notebooks did the shopkeeper
sale in a year so that's again a huge
number or how much profit or how much
loss did the shopkeeper make so they are
also you talk of huge numbers you talk
about distances maybe the distance
between two cities so that's also again
a big number because two cities are not
well in here or if you talk about the
distance between two countries again
they are big numbers you talk about
weighs heavy weights so there a lot of
places where we very commonly use larger
numbers now when we talk of these larger
numbers or when we use these larger
numbers to measure some quantity for
example if we are talking about distance
we say that distance between two cities
is let's say some 700 kilometers so not
only the number 700 defines it alone you
also need an unit to define the distance
for example 2
find the distance we used a unit like
kilometer now when we talk about units
an important concept comes into picture
and that is conversion of units now
there are various units available to
measure any quantity whether it is
distance whether it is weight whether it
is volume so to measure any quantity we
have certain specified units in these
units also we have smaller units we have
larger units smaller units to define
smaller quantity larger units to define
larger quantities for example let's say
we talk about the distance between two
cities Bangalore and Chennai
and let's say that the distance between
these two cities is approximately I mean
they aren't very near right so the
distance is huge it is not the distance
between your house and your school which
might be quite near now since you are
measuring a longer distance or a larger
distance you need a larger unit now here
we have so many units and we you make
use of the bigger unit that is kilometer
and we say that the distance is
approximately 600 kilometers so that's
just an approximate number so that's
that's how we define the distance
between two cities like Bangalore and
Chennai now you might ask so why do do
we really need to have so many units yes
we need them because not every time we
are measuring such big distances now
sometimes we also might need to measure
a say a very small distance may be the
thickness of a page now the thickness of
a paper that is like really really thin
it is very small that that distance is
going to be very very small so that is
when we make use of smaller units like
millimeter so now these are the variety
of units that we have and depending upon
how much big or how much small the
number is we can make use of each of
these units and these units can be
converted from one
unit to another let's say 600 kilometer
if I want I can write 600 kilometer in
terms of meter as well so it is just
that 600 kilometer would mean 600 in
2000 meters basically this much meters
similarly if I want to write the same
unit in many millimeters we can even do
that just that the number will become
very very huge and it is very difficult
to remember or to write such a big
number and that is why we make use of
bigger units instead so that the number
remains small like here the number is
just 600 but the unit is kilometer which
is a bigger unit so basically we are
defining the same quantity but in a more
convenient way right okay so now the
important concept here is how do we
convert from one unit to another so that
is another important thing that we will
learn here
so here the units that we have are busy
centi deci meter on liter take a hecto
kilo now how do we call these units now
let's say that when you are measuring
length length would move may be distance
height width anything that would all
come under length so when you're
measuring length your unit would be
meter and in that case this becomes mini
meter which is written as mm this
becomes centimeter which is written as
cm this becomes deci meter this is meter
this is take a meter this is hectometer
and missus kilo meter so that is how
your units are now let's say you are
measuring volume which is in liters so
in that case your meter becomes liter
and therefore this becomes milliliter
centimetre deciliter take a liter
hectolitre and kilo meters right so
similarly when you a major weight then
you measure in terms of grams so you
have ground you have milligrams website
you have kilograms a programs and so on
so that's how the unit values depending
on which quantity you are measuring
whether it is volume or it is length or
it is weight so that van is right so now
the question is what about the
conversion or even before conversion you
might ask that how am I going to
remember so many units milli centi deci
meter deca hectare hello so how are you
going to remember this series now it is
very important now it is not only
important to remember the names it is
also important to remember the order
because this order is very crucial if
you remember the order you will be very
easily able to convert from one unit to
another because that is our final agenda
that if I have to convert a some amount
from kilometer to meet her how do I do
that or if I have to convert something
from millimeter to kiloliter how do I do
that
so in order to do this conversion easily
it is very important that you remember
this sequence milli centi deci meter
thick ahead to hello so how do I
remember this so for that let us make
use of a memory tip which will help you
to remember this now this is something
which is very relevant to children of
your age now if I ask you to remember or
memorize this mainly Sentai decimeter
take ahead talk hello that might sound
really boring and difficult to remember
now instead of this you can just
remember this sentence which might be
true for a lot of you McDonald I'm sure
all of you know what McDonald is so
McDonald is the most dearest to happy
Hills now do you think that this is an
easy sentence for you to remember yes I
think so because McDonald's is a
favorite to a lot of you now if you
remember the center
it is like McDonald MCD is the most
dearest to happy kids so here M is for
mili senti deci meter deca hecto hello
and that's how you can remember the
remember the unit's because if you
remember kay-kay will remind you of
pillow H will remind you of Hector M
will remind you of many so McDonald is
the most dearest to happy kids and
that's how you remember milli senti
decimeter deca Hector kilo now you know
these names it is just that you often
tend to forget the order in which they
are placed and why is it important to
remember the order that's because if you
remember the order so we know that the
smaller unit has is at this end so milli
is the smallest unit and kilo is the
biggest unit so this is basically
arranged in an order so meaning is the
smallest next is sin T so sin T is
smaller than desi desi is smaller than
meter me Jonas mornin and Decker Decker
and smaller than hecto and Hector is
smaller than kilo so we see any kilo is
the biggest of all of these and meaning
is the smallest of all of this so since
it is arranged in an increasing order so
it is important to remember to order now
let's come to the conversion now every
time you want to convert something from
a smaller unit to a bigger unit let's
say you want to convert something from
centimeter to decameter or centimeter to
hectometer so basically you are moving
down right so from up to down so
whenever you are moving down what you do
you need to divide so this is a simple
rule that you need to remember whenever
you are moving down that is whenever you
are converting from a unit which is at
the top to a unit which is added down so
if you are doing conversion from
centimeter to kilometres you are
basically moving down and whenever you
are moving down you need to divide now
you might ask
/ what okay that's important thing now
for every step you divide by 10 so let's
say from milli to senti if you want to
convert from mini to senti what you do
you divide the number by 10 if you want
to convert from sin T to deci you divide
by 10 now what if you have to convert
from Millie to Daisy so you need to jump
two steps so you basically divide by 100
so the number of zeros increase by one
in every step so for every step one zero
is increasing and when you are moving
down you are dividing just the opposite
when you are moving up what will you do
as you move up you will multiply
multiply by what multiply by ten and
again the number of zeros will keep
increasing with every step so if you
want to convert from kilo to hecto what
you do you multiply by ten you want to
convert from hecto Deka you multiply by
ten you want to convert from Dakar to
meter you multiply by ten if you want to
convert from kilo 2 meter so you will
multiply because you are moving up and
by how many steps are you moving up one
two three so you will multiply by 1 3
times 0 that is thousand so you have to
multiply by thousand similarly if you
want to convert from kilo to deci so
there also you will multiply because you
are moving from moving upward and with
what one two three four steps therefore
four zeros so you will multiply it by
10,000 so that is the concept of
converting conversion of units and I
hope you will remember this so what are
the important points that you need to
remember for conversion of units first
thing is remember the order of the units
and for that you remember
McDonald is the most dearest to happy
kids that is milli senti decimeter deca
Hector kilo right now whenever you move
down you divide divide by what divided
by n hundred thousand depending on so
the number of zeros will depend on how
many jumps you need to make so if you
are jumping from Billy to meter so how
many jumps from milli two meter one two
three jumps so you will divide by
thousand because you are coming down so
divided by and three zeroes because
there are three jumps simple similarly
if you are converting from a bigger unit
to a smaller unit that is if you are
moving up you need to multiply multiply
by what multiplied by ten hundred
thousand again the number of zeros will
be decided by the number of jumps that
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