## Friday, May 06, 2011

### Real number

CBSE TEST PAPER-01
MATHEMATICS (Class-10)
Chapter 1. Real Numbers
1.    Express 140 as a product of its prime factors
2.    Find the LCM and HCF of 12, 15 and 21 by the prime factorization method.
3.    Find the LCM and HCF of 6 and 20 by the prime factorization method.
4.    State whether13/3125 will have a terminating decimal expansion or a non-terminating repeating decimal.
5.    State whether 17/8 will have a terminating decimal expansion or a non-terminating repeating decimal.
6.    Find the LCM and HCF of 26 and 91 and verify that LCM × HCF = product of the two numbers.
7.    Use Euclid’s division algorithm to find the HCF of 135 and 225
8.    Use Euclid’s division lemma to show that the square of any positive integer is either of the form 3m or 3m + 1 for some integer m
9.    Prove that √3 is irrational.
10. Show that 5 – √3 is irrational
11. Show that any positive odd integer is of the form 6+ 1, or 6+ 3, or 6+ 5, whereis some integer.
12. An army contingent of 616 members is to march behind an army band of 32 members in a parade. The two groups are to march in the same number of columns. What is the maximum number of columns in which they can march?

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