# NCERT Solutions for Class 6 Math Chapter 1: Knowing our Numbers This chapter introduces the students to the larger numbers, their representation, arrangement, and other important aspects associated with them. Topics like Estimation and approximation, Expanding brackets, Roman Numerals, Large numbers in practice, Metric System, Indian System of Numeration & International System of Numeration, Comparing Numbers and place value has been dealt with in this chapter. Topics covered in the unit are not only a revision of the previously covered section, but also new concepts have been introduced to build upon the concepts learnt in the first chapter of class 6 NCERT mathematics. The primary focus of the chapter is to develop cognitive skills and help students with calculations which are done in everyday life. In chapter 1 of the NCERT Class 6 mathematics, you will learn:

• Estimation and approximation
Estimation involves approximating a quantity to accuracy required
• Expanding brackets
This topic helps the student understand the usage of brackets in the right place.
• Roman Numerals
Roman numeral system is a system prevalent in many places. Some Roman numerals are: I V X L C D M
• Large numbers in practice
Large numbers are to be dealt with in everyday life. This topic helps the student understand and do mathematical operations with large numbers.
• Metric System
The representation of larger numbers in smaller numerals using a more extensive unit
• Indian System of Numeration & International System of Numeration
The use of commas differs in the Indian System of Numeration and the International System of Numeration. In the Indian system of numeration, there are commas after 3, 5, and 7 digits which separate the thousand, lakh, and crore values respectively. In the International system of numeration, commas are placed after every three digits starting from the right.
• Revisiting place value
This is the topic which teaches the students about the value of the digit according to its place in a number.