Keeping in mind the IQ level of a child every effort has been made to depict the concepts in clear and precise way. In earlier classes, we have learned about addition, subtraction, multiplication, and division of numbers. We have also learned about some patterns of number sequences and solved many interesting problems with numbers.

Here, we will learn about representing a number in digits or figures and how to express a number in words. Methods to express a number in the word form are commonly of two types:

(i) The Indian system of numeration.

(ii) The International system of numeration.

In order to read numbers in the Indian system of numeration, we group place values into periods. ‘Ones’, ‘thousands’, ‘lakhs’, ‘crores’, are periods. Various examples are covered to explain each of the above methods in detail. In the Indian system of numeration, each digit of a number has a place and face value. The place value of a digit depends on its position, whereas, the face value does not depend on its position. Learn these concepts easily by practicing the questions from the exercises given in RD Sharma solution for the chapter “Knowing our numbers”.