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Hey Starry! I want to
buy a new table cloth, the old one has been torn a little.
But I’m not sure how
big the table cloth should be?
Wait, I have an idea.
We shall fisrt measure
the length of the table and then I can get the table cloth of that size.
Stary ! we shall
measure the length of the table with a span.
A span is formed when
the fingers are spread out.
The length of this
table is 7 spans.
Hey,Starry ! we can also
measure the length of the table using an arm-length.
An arm –length is also
known as a cubit?
Let’s measure the
length of the table.
The length of the
table is 3 arm lengths or 3 cubits.
Ok, now, let me go to buy a tablecloth measuring seven spans or 3 arm-lengths.
Ok, now, let me go to buy a tablecloth measuring seven spans or 3 arm-lengths.
Stary! Just like we
use a span or an arm-length to measure the length.
we can also use the
feet and pace for measuring the lengths.
Look at the picture
shows here.
Ram is measuring the
length of his room using his foot.
The length of his room
is 20 foot-lengths.
But stary! what if Ram
had to measure the length of his garden.
Measuring by foot
would take a long time.
So Ram measures the
length of the garden with his pace.
It was 8 paces long.
Stary, can you think
of any other ways in which we can measure the length ?
Yes, we can also
measure the length using a pencil or a stick or a rod.
Stary! take a look at
these 2 pictures.
In the 1st picture we
see that the girl measured the length of the blackboard by using arm-lengths.
It lengths was 4 arm-lengths.
In the 2nd pictures
the teacher has measured the length of the same blackboard using her arm- lengths.
Now the length of the
blackboard is 3 arm lengths.
In the picture given here.
The length of the
carpet was measured by the boy using his foot length.
The length was 12 foot
lengths.
The same carpet was
measured by his father using his foot length .
Now the length of the
carpet was 9 foot lengths.
Can you tell Stary why is there a difference in the lengths of the same objects?
You are smart, Stary.
The number of
arm-length or foot length counted by both the people in each people
is not the same because the length of their arm or feet is not the same .
Hey Stary,See here are
some chart papers.
let’s measure the
length of this chart paper using a ruler.
The length of the
chart paper is 2 ruler lengths.
What’s happen Stary ?
you have already
measured of the length of the chart paper using the same scale.
What answer did you
get ? 2 ruler lengths.
That’s great !
So it mean if we
measure the length of the object with the same instrument then the measure
remain the same no matter who measure it.
Stary ! Let’s now find
the length of these rod.
The rods have been
labeled A, B, C, D to identify them.
Let’s use the scale
again.
The length of the rod
A is 2 ruler length .
Now let measure the
length of rod B.
The length of the rod
B is 3 ruler lengths.
What is the measure of
the 3rd rod, Stary?
It looks smallest. Hey
! Its length is only 1 ruler length.
Now, let’s measure the
last rod.
The length is equal to
the length of the rod B .
That is 3 ruler lengths.
That is 3 ruler lengths.
Stary ,out of rod A and
rod B which rod has less length.
Yes, the length of rod
A is less than the length of rod B.
Out of rod D & C
whose length is more?
yes, the length of rod
D is more than the length of rod C.
Stary, Here are the
name of some articles, you have to give the best possible method of measuring
their lengths.
+ The first one is a
book.
How we use measure in
the length Stary?
Yes, by using the span
of your hand.
+ The height of
cupboard is the best measure by an arm-length.
+ What about the
length of the ground, Stary?
Yes, we measure it by
using the pace of the foot.
+ The last is the
length of ribbon.
We can measure it
using an arm-length.
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