Decimals Class 6 PPT

 Page 1


Chapter - VIII
Decimals
Page 2


Chapter - VIII
Decimals
Introduction
? In this chapter we shall learn about another kind of 
numbers called decimals.
? This has close links with the previous chapter on fractions, 
as we shall soon see.
? We denote one tenth of the whole as 1/10 or as 0.1 in 
decimal system.
? We denote one hundredth part as 0.01 in decimal system.
? Thus if we wish to write 32 and four-tenths in decimals we 
shall write it as 32.4 ! 
Page 3


Chapter - VIII
Decimals
Introduction
? In this chapter we shall learn about another kind of 
numbers called decimals.
? This has close links with the previous chapter on fractions, 
as we shall soon see.
? We denote one tenth of the whole as 1/10 or as 0.1 in 
decimal system.
? We denote one hundredth part as 0.01 in decimal system.
? Thus if we wish to write 32 and four-tenths in decimals we 
shall write it as 32.4 ! 
Points to notice 
? Like we don't give value to the zeros added to the left of 
integers, zeros added to the right of decimals have no value 
! 
? Example, 0.1=0.10=0.100=...... 0.10000000.... 
? But Zeros added immediately after the decimal point, are 
to be given importance . 
? For example, 0.1 is not same as 0.01 ! 
? If there is a zero before the decimal point, it is dropped in 
the notation ! Example 0.123 can be written as .123 ! 
Page 4


Chapter - VIII
Decimals
Introduction
? In this chapter we shall learn about another kind of 
numbers called decimals.
? This has close links with the previous chapter on fractions, 
as we shall soon see.
? We denote one tenth of the whole as 1/10 or as 0.1 in 
decimal system.
? We denote one hundredth part as 0.01 in decimal system.
? Thus if we wish to write 32 and four-tenths in decimals we 
shall write it as 32.4 ! 
Points to notice 
? Like we don't give value to the zeros added to the left of 
integers, zeros added to the right of decimals have no value 
! 
? Example, 0.1=0.10=0.100=...... 0.10000000.... 
? But Zeros added immediately after the decimal point, are 
to be given importance . 
? For example, 0.1 is not same as 0.01 ! 
? If there is a zero before the decimal point, it is dropped in 
the notation ! Example 0.123 can be written as .123 ! 
Number Line
? Like integers and fractions, decimals can also be 
represented in the number line.
? We first decide into how many parts should we divide the 
successive points in the number line.
? If there are 2 digits after the decimal point, we make 100 
divisions, if there are 3 digits then we make 1000 divisions 
and so on.
? We can go on magnifying the number line to get more and 
more decimals . 
Page 5


Chapter - VIII
Decimals
Introduction
? In this chapter we shall learn about another kind of 
numbers called decimals.
? This has close links with the previous chapter on fractions, 
as we shall soon see.
? We denote one tenth of the whole as 1/10 or as 0.1 in 
decimal system.
? We denote one hundredth part as 0.01 in decimal system.
? Thus if we wish to write 32 and four-tenths in decimals we 
shall write it as 32.4 ! 
Points to notice 
? Like we don't give value to the zeros added to the left of 
integers, zeros added to the right of decimals have no value 
! 
? Example, 0.1=0.10=0.100=...... 0.10000000.... 
? But Zeros added immediately after the decimal point, are 
to be given importance . 
? For example, 0.1 is not same as 0.01 ! 
? If there is a zero before the decimal point, it is dropped in 
the notation ! Example 0.123 can be written as .123 ! 
Number Line
? Like integers and fractions, decimals can also be 
represented in the number line.
? We first decide into how many parts should we divide the 
successive points in the number line.
? If there are 2 digits after the decimal point, we make 100 
divisions, if there are 3 digits then we make 1000 divisions 
and so on.
? We can go on magnifying the number line to get more and 
more decimals . 
.