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(i)Knowing our Numbers Large numbers upto one crore Reading and writing of large numbers Comparing large numbers Indian System of Numeration International System of Numeration Use of large numbers Estimation of numbers Use of brackets Roman numerals(ii)Whole Numbers Natural numbers Predecessor and successor of a natural number Whole numbers: The natural numbers along with zero formthe collection of whole numbers. Representation of whole numbers on the number line Addition and subtraction of whole numbers on the numberline Properties of whole numbers :Closure EXEMPLAR PROBLEMSUNIT-1 Commutativity of addition and multiplicationAssociativity of addition multiplicationDistributivity of muliplication over additionIdentities for addition and multiplication Division of a whole number by zero is not defined Patterns in whole numbers(iii)Playing with Numbers Factors and multiples number of factors of a given number is finite number of multiples of a given number is infinite Perfect number : A number for which sum of all its factors isequal to twice the number .
MATHEMATICS UNIT 1 NUMBER SYSTEM (A) Main Concepts and Results (i) Knowing our Numbers • Large numbers upto one crore • Reading and writing of large numbers
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