Chapter 1 | Square and Square Roots Class-8 DAV Secondary Mathematics

Are you looking for DAV Maths Solutions for class 8 then you are in right place, we have discussed the solution of the Secondary Mathematics book which is followed in all DAV School. Solutions are given below with proper Explanation please bookmark our website for further updates!! All the Best !!

Unit 1 Brain Teaser | DAV SOLUTIONS CLASS 8 Secondary Mathematics

1.A. Tick (✓) the correct option.

(a) The difference between the squares of two consecutive number is equal to their—

(i) difference (ii) sum (iii) product (iv) quotient

Answer (a): (ii) Sum

(b) What will be the digit in the thousands place of (1111)^2?
(i) 3 (ii) 4
(iii) 2 (iv) 1

Answer (b): (ii) 4

(c) Perfect squares cannot have 2, 3, ______ and_______ in its ones place.
(i) 1, 7 (ii) 5, 6
(iii) 7, 8 (iv) 7, 9

Answer (a): (iii) 7, 8

(d) The smallest number by which 72 must be divided to make it a perfect square is—
(i) 4 (ii) 5
(iii) 3 (iv) 2

Answer (d): (iv) 2

(e) The square root of 3.052009 has_______ decimal places.

(i) 3 (ii) 4 (iii) 5 (iv) 1

Answer (e): (i) 3

B. Answer the following questions.

(a) How many non-square numbers are there between 13^2 and 14^2?

(b) Write the first four triangular numbers.

(c) Is 5, 7, 9 a Pythagorean triplets? Why? Justify.

(d) Find √9 by repeated subtraction method.

(e) Find the measure of the side of a square handkerchief of area 324 cm2.

Answer 1 (B):

2. Find the square root of 10 correct to four places of decimal.

3. Find the values of: √3.1428 and √0.31428 correct to three decimal places.

4. Simplify:

5. The area of a square field is 101 1/400 m2. Find the length of one side of the field.

6. What is that number which when multiplied by itself gives 227.798649?

7. In a lecture hall, 8,649 students are sitting in such a manner that there are as many students in a row as there are rows in the lecture hall. How many students are there in each row of the lecture hall?

8. A General wishing to draw up his 64,019 men in the form of a square found that he had 10 men extra. Find the number of men in the front row.