# Real Numbers: CBSE Class 10 NCERT Solution

Here you can find the Mathematics NCERT Solution for CBSE Class 10 Real Numbers. It includes a detailed explanation of the NCERT Solution and the covers the various methods and Technique of solving the Questions assigned in the NCERT textbooks.

Created On: Nov 10, 2014 15:35 IST
Modified On: Dec 12, 2014 15:57 IST

Find CBSE Class 10 NCERT Solutions for Real Numbers (Maths Chapter 1). It has been framed keeping the Students' perspective in mind. This will help the Students with easy and simple understanding of the concept and technique employed in solving this NCERT Solution as per the CBSE Marking Scheme.

NCERT Class 10 Maths Solutions- Chapter 1 Real Number

Some of the NCERT Class 10th Maths Chapter 1 (Real Numbers) Questions are -

1. Use Euclid's division algorithm to find the HCF of:
(i) 135 and 225
(ii) 196 and 38220
(iii) 867 and 255

2. Show that any positive odd integer is of the form  6q + 1, or  6q + 3, or 6q + 5, where q is some integer.

3. 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?

4. Use Euclid's division lemma to show that the square of any positive integer is either of form 3m or 3m + 1 for some integer m.

5. Use Euclid’s division lemma to show that the cube of any positive integer is of the form 9m, 9m+1 or 9m + 8.

6. Find the LCM and HCF of the following pairs of integers and verify that LCM × HCF = Product of the two numbers.
(i) 26 and 91
(ii) 510 and 92
(iii) 336 and 54

7. Find the LCM and HCF of the following integers by applying the prime factorization method.
(i) 12, 15 and 21
(ii) 17, 23 and 29
(iii) 8, 9 and 25.

8. Given that HCF(306, 657) = 9. Find LCM(306, 657).

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

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

11. There is a circular path around a sports field. Sonia takes 18 minutes to drive one round of the field, while Ravi takes 12 minutes for the same. Suppose they both start at the same point and at the same time, and go in the same direction. After how many minutes will they meet again at the starting point?

12. Prove that 3 + 2 is irrational.

13. The following real numbers have decimal expansions as given below. In each case, decide whether they are rational or not. If they are rational, and of the form , what can you say about the prime factors of q?
(i) 43.123456789
(ii) 0.120120012000120000…
(iii) 43.123456789

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