(1) Counting numbers 1, 2, 3, 4, 5, 6, ... etc. are known as natural numbers.
(2) 1 is the smallest natural number.
(3) 0. 1. 2, 3, 4, 5, 6, 7, 8, and 9 are called digits, and a group of digits denoting a number is called a numeral or a number.
(4) The method of representing a number in digits or figures is called notation and the method of expressing a number in words is called numeration. There are two methods of numeration:
(1) Place value of a digit in a number = Its face value × Position value
(2) 1 million = 10 lakhs
10 million = 1 crore
100 million = 10 crores
1 billion = 100 crores or 1 Arab.
(3) 1 km = 1000 meter (m)
1 meter = 100 centimetre (cm)
1 cm = 10 millimetre (mm)
1 kilogram (kg) = 1000 grams (gm)
1 litre = 1000 millilitres (m1)
(4) In order to estimate or round off a number to the nearest —
(a) tens:
(b) hundreds:
(c) thousands:
(5) The Roman numerals with the corresponding Hindu – Arabic numerals are:
(6) To get the values of given roman numerals, we use the following rules:
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1. How can knowing important formulas help in understanding numbers better? 
2. What are some examples of important formulas in the topic of Knowing Our Numbers in Class 6? 
3. How can students effectively memorize important formulas for their exams? 
4. Why is it important to have a thorough understanding of the formulas rather than just memorizing them? 
5. How can teachers help students in mastering important formulas related to Knowing Our Numbers? 

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