2. Kavitha went to shopping to buy clothes for her family and she came
to the cash counter to pay the bill
In the bill the price of watches is represented by 299.00 and the price of socks
is 32.99
The numbers 299.00 and 32.99 are known as decimal numbers
4. PARTS OF DECIMAL NUMBERS
45 . 99
WHOLE PART
OR
INTEGRAL
PART
DECIMAL
POINT
DECIMAL
PART
5. PICTORIAL REPRESENTATION OF DECIMAL
NUMBERS
The decimal number 12.2 can be represented pictorially as follows:
The whole part 12 is represented by 12 boxes which is depicted by 10 boxes which comes
under tens place and then two boxes which comes under ones place
again one box according to place value
The decimal part 2 is represented by sheets of 2
• This is read as 10 tens 2 ones and 2 tenths.
6. • This shaded region can be expressed in fraction
form as 1 in which the denominator can be
5
converted into powers of 10 and represented into
decimal form as 0.2
7. EXPANDED FORM OF A NUMBER AND
DECIMAL NUMBER
NUMBERS
3768
The number can be expanded in the form
3 x 1000 + 7 x 100 + 6 x 10 + 8
DECIMAL NUMBERS
235.68
The number can be expanded in the form
2 x 100 + 3 x 10 + 5 x 1 + 6×
1
10
+ 8 ×
1
100
10. SUMMARY
• Decimal is derived from the latin word ‘decimus’ which means tenth
• Decimal number has three parts whole number, decimal point and decimal part
• Fraction can be converted into decimals by converting the denominator inton powers of 10
• The number after the decimal point in the place value is read as tenth, hundredth and
thousandth
11. ACTIVITIES
1. Represent the decimal numbers pictorially 5 ones and 3 tenths
2. Write the place value of underlined digits 35.677
3. Write the decimal number in the place value grid 9.675
4. Collect pictures of bills and paste in the notebook
5. Name the parts of decimal numbers
