Observe the following pattern and supply the missing number.
11² = 121
101² = 10201
10101² = 102030201
1010101² = ........................
...........² = 102030405030201

What will be the unit digit of the squares of the following numbers?
(i) 81 (ii) 272 (iii) 799 (iv) 3853 (v) 1234 (vi) 26387 (vii) 52698 (viii) 99880 (ix) 12796 (x) 55555

Observe the following pattern and find the missing digits.
11² = 121
101² = 10210
1001² = 1002001
100001² = 1 ............. 2 ..............1
10000001² = ........................

The following numbers are obviously not perfect squares. Give reason.

(i) 1057 (ii) 23453 (iii) 7928 (iv) 222222 (v) 64000 (vi) 89722 (vii) 222000 (viii) 505050

The squares of which of the following would be odd numbers?

(i) 431 (ii) 2826 (iii) 7779 (iv) 82004