CBSE Class 8 Mathematics Squares and Square Roots Assignment Set D

Questions carrying 2 Marks each:-

Q.5 Without adding, find the sum : 1+3+5+7+9.

Q.6 How many numbers lie between squares of 30 and 31?

Q.7 Find the square root of 144 by using method of repeated subtraction.

Questions carrying 3 marks each:-

Q.8 Using property, find the square of a number ending in 5, the number is 3 2-.

Q.9 Find the smallest number by which 2100 must be multiplied so that the product become a perfect square. Find the square root of the number so obtained.

Q.10 11025 students are sitting in a lawn in such a way that there are as many students in a row as there are rows in the lawn. Find the number of rows in the lawn.

Q.11 Find the greatest number of five digits which is a perfect square.

Q.12 Find the square root of 2 correct up to 2 decimal places.

Q.13 Find the least number which must be subtracted from 45156 to make it a perfect square.

Q.14 Find the square root of 39.0625 by division method.

Multiple choice Questions carrying 1 mark each:-

Q.15 If a perfect square is of n-digits, then its square root will have n/2 digits if
(a) n is odd
(b) n is even
(c) n is prime
(d) none of these

Q.16 The number of zeros in the square of 400 will be
(a) 2
(b) 1
(c) 3
(d) 4