MATHS CHAPTER 1 REAL NUMBER WORK SHEET

1.               7  x 11 x 13 x 15+ 15 is a 

                (a) Composite number (b) Whole number (c) Prime number (d) None of these

      2.         The smallest composite number is:- (a) 1 (b) 2 (c) 3 (d) 4

    

      3.          (2+( 2 +「5 )) is (a) rational (b) irrational (c) An integer (d) Not real

    

      4.         2.13113111311113……is (a) a rational number (b) a non terminating decimal number (c) an               irrational number (d) both (a) & (c)

      5.       Use Euclid’s division algorithm to find the HCF of 4052 and 12576

      6.       Find the largest number which divides 245 and 1029 leaving remainder 5 in each case.

      7.      A shop keeper has 120 litres of petrol, 180 litres of diesel and 240 litres of kerosene. He wants              to sell oil by filling the three kinds of oils in tins of equal capacity. What should be the greatest            capacity of such a tin.

      

       8.    Use Euclid division lemma to show that cube of any positive integer is either of the form                      9m. (9m+1) or 9m+8.

       9.    Find HCF and LCM of 18 and 24 by the prime factorization method.

      10    The HCF of two numbers is 23 and their LCM is 1449. If one of the number is 161, find the                 other.