NCERT Grade 6 Mathematics Chapter 1, Knowing Our Numbers deals with number systems, basic operations, etc. Students have learnt working with numbers in previous classes. They have added, subtracted, multiplied and divided numbers. They also looked for patterns in number sequences and done many other interesting things with numbers. In this chapter, students shall move forward on such interesting things with a bit of review and revision as well.

The topics and sub-topics in Chapter 1 Knowing our Numbers are given below.

• Ex 1.1 – Introduction
• Ex 1.2 – Comparing Numbers
• Ex 1.2.1 – How many numbers can you make?
• Ex 1.2.2 – Shifting digits
• Ex 1.2.3 – Introducing 10,000
• Ex 1.2.4 – Revisiting place value
• Ex 1.2.5 – Introducing 1,00,000
• Ex 1.2.6 – Larger numbers
• Ex 1.2.7 – An aid in reading and writing large numbers
• Ex 1.3 – Large Numbers in Practice
• Ex 1.3.1 – Estimation
• Ex 1.3.2 – Estimating to the nearest tens by rounding off
• Ex 1.3.3 – Estimating to the nearest hundreds by rounding off
• Ex 1.3.4 – Estimating to the nearest thousands by rounding off
• Ex 1.3.5 – Estimating outcomes of number situations
• Ex 1.3.6 – To estimate sum or difference
• Ex 1.3.7 – To estimate products
• Ex 1.4 – Using Brackets
• Ex 1.4.1 – Expanding brackets
• Ex 1.5 – Roman Numerals