Ncert Solutions for Class 6 Maths Chapter 9 Data Handling Exercise 9.2:-
Exercise 9.2 Class 6 maths NCERT solutions Chapter 9 Data Handling pdf download:-
Ncert Solution for Class 6 Maths Chapter 8 Data Handling Exercise 9.2 Tipss:-
Representing Decimals on number line
We represented fractions on a number line. Let us now represent decimals
too on a number line. Let us represent 0.6 on a number line.
We know that 0.6 is more than zero but less than one. There are 6 tenths in
it. Divide the unit length between 0 and 1 into 10 equal parts and take 6 parts
as shown below :
Write five numbers between 0 and 1 and show them on the number line.
Can you now represent 2.3 on a number line? Check, how many ones and
tenths are there in 2.3. Where will it lie on the number line?
Show 1.4 on the number line.
David was measuring the length of his room.
He found that the length of his room is 4 m
and 25 cm.
He wanted to write the length in metres.
Can you help him? What part of a metre will
be one centimetre?
Take a square and divide it into ten equal parts.
What part is the shaded rectangle of this square?
10 or one-tenth or 0.1, see Fig (i).
Now divide each such rectangle into ten equal parts.
We get 100 small squares as shown in Fig (ii).
Then what fraction is each small square of the whole
Each small square is ( ) 1
100 or one-hundredth of the
whole square. In decimal notation, we write ( ) 1
100 = 0.01
and read it as zero point zero one.
What part of the whole square is the shaded portion, if
we shade 8 squares, 15 squares, 50 squares, 92 squares of
the whole square?
What have we discussed?
1. To understand the parts of one whole (i.e. a unit) we represent a unit by a block. One
block divided into 10 equal parts means each part is
10 (one-tenth) of a unit. It can
be written as 0.1 in decimal notation. The dot represents the decimal point and it
comes between the units place and the tenths place.
2. Every fraction with denominator 10 can be written in decimal notation and vice-versa.
3. One block divided into 100 equal parts means each part is ( ) 1
100 (one-hundredth) of
a unit. It can be written as 0.01 in decimal notation.
4. Every fraction with denominator 100 can be written in decimal notation and
5. In the place value table, as we go from left to the right, the multiplying factor becomes
10 of the previous factor.
The place value table can be further extended from hundredths to
10 of hundredths
i.e. thousandths (
1000 ), which is written as 0.001 in decimal notation.
6. All decimals can also be represented on a number line.
7. Every decimal can be written as a fraction.
8. Any two decimal numbers can be compared among themselves. The comparison can
start with the whole part. If the whole parts are equal then the tenth parts can be
compared and so on.
9. Decimals are used in many ways in our lives. For example, in representing units of
money, length and weight.