TS 10th class Maths 1st Chapter

                            1. Real numbers

Exercise-1.2

1. Express each of the following numbers as a product of its prime factor

(1) 140     (2) 156       (3) 3825     (4) 5005      (5)7429

2. Find the LCM and HCF  of the following intergers by the prime factorization method

(1) 12,15 and 21        (2)17,23 and 29     (3) 8,9 and 25

(4)72 and 108       (5) 306 and 657

3. Check whether 6^n  can end with the digit 0 for any natural number n.

4. Explain why 7*11*13+13 and 7*6*5*4*3*2*1+5  are composite numbers.

5. How will you show that(17*11*2)+(17*11*5)  is a composite number Explain.

6. Which digit would occupy the units place of resulting number of  6^100.