Theory:

Numbers are useful to count or measure the objects. They help us to compare quantities and say which is bigger and arrange them in order.
In previous classes, we learned how to add, subtract, multiply and divide numbers. Also, we tried to get patterns in number sequences and learned many interesting things with numbers.
 
Now we are going to learn about large numbers.
 
Have you ever tried to read your father's mobile number in mathematical word form?
 
Have you counted the number of digits in Aadhar number(UIN)?
 
Have you ever think of the words million', crore, lakh, billion' when you heard in the news?
 
In all the above cases, we dealt with big numbers.
 
Here we understand the large numbers with its terms used to represent.