Knowing Our Numbers Worksheet With Answers Page 3
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7Knowing our numbers
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writing numbers
To write numbers (numerals) for number names, consider the following examples:
(i) In a number, if a place is vacant then put 0 at that place. The number ‘seven thousand thirty
two’ consists of a collection of 7 thousands, 3 tens and 2 units i.e. it consists of 7 thousands,
0 hundreds, 3 tens and 2 units.
This number is represented by writing 7 at thousand’s place, 0 at hundred’s place, 3 at ten’s
place and 2 at one’s place.
Thus, the number is written as ‘7032’.
The expanded form of the number is
7032 = 7 × 1000 + 0 × 100 + 3 × 10 + 2
= 7000 + 0 + 30 + 2
= 7000 + 30 + 2
(ii) The number ‘eighty three crore seventy lakh twenty five thousand two’ consists of 83 crores,
70 lakhs, 25 thousands and 2 ones i.e. it consists of 8 ten crores, 3 crores, 7 ten lakhs,
0 lakhs, 2 ten thousands, 5 thousands, 0 hundreds, 0 tens and 2 ones.
This number is represented by writing 8 at ten crore’s place, 3 at crore’s place, 7 at ten lakh’s
place, 0 at lakh’s place, 2 at ten thousand’s place, 5 at thousand’s place, 0 at hundred’s place,
0 at ten’s place and 2 at one’s place.
Thus, the number is written as ‘837025002’.
The above numbers are written in the place value chart as under:
Periods
...
Crores
Lakhs
Thousands
Ones
Places
TC
C
TL
L
TTh
Th
H
T
O
7
0
3
2
Numbers
8
3
7
0
2
5
0
0
2
remarks
If a place is vacant in a number, put 0 at that place.
Never write 0 at the higher place of a number i.e. do not put 0 as the extreme left
digit of a number. For example, the number seven hundred thirty five is written as 735
and not as 0735.
reading numbers
To read large numbers, we insert commas after each period starting from ones period. In the Indian
system, the various periods from the right are: ones, thousands, lakhs, crores and so on.
For example, the number 29307546 in the Indian system can be written as
2, 93, 07, 546.
It is read as “two crore ninety three lakh seven thousand five hundred forty six”.
internationaL system of numeration
In the International system:
1000 × 1000 i.e. 1000000 is called million,
1000 × 1000000 i.e. 1000000000 is called billion and so on.
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