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SAI International School
                                                      CLASS - X

               Mathematics

               CHAPTER-1: Real Numbers
               Worksheet-2




               1.                                                                                      1



               2.                                                                                      1



               3.    Find the least positive integer divisible by 20 and 24.                           1

               4.    Can two numbers have 15 as their HCF and 175 as their LCM? Give                   1
                     reason.

               5.       √                                                                              1
                            is ____________ number.


               6.    The LCM of smallest two digit composite number and smallest composite             1
                     number is ______.

               7.    HCF(a, b) = 12 and a x b = 1800. LCM(a, b) = ____.                                1

               8.    The largest number which divides 70 and 125, leaving reminder 5 and 8             1
                     respectively is ______.


               9.    Express 2.35 in   form.                                                           2



               10.  Two tankers contain 144 litres and 90 litres of petrol respectively. Find the      3
                     maximum capacity of a container which can measure the petrol of either
                     tanker in exact number of times.

                                  2
               11.  Prove that x – x is divisible by 2 for every positive integer x.                   3

               12.  Find H.C.F. of 180, 252 and 324 using Euclid’s Division Lemma.                     3
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