Q2 of 67 Page 168

If a number ends in 5 zeros, its square ends in:

The number of zeroes of a number gets doubled in its perfect square. For example:

10² = 100, 100² = 10000, and so on.

So, if a number ends in 5 zeroes, its square ends in 10 zeroes.

The number of perfect squares from 1 to 500 is:

The last digit of a perfect square can never be

Which could be the remainder among the following when a per feet square is divided by 8?

The 6^th triangular number is:

Questions · 67

5. Squares, Square-Roots, Cubes and Cube-Roots

1 2 3 4 5 1 2 3 4 1 1 1 1 2 3 1 1 1 1 1 2 2 2 2 2 2 3 4 5 1 2 3 1 2 3 4 5 6 1 1 1 1 1 2 2 2 3 1 2 2 2 2 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16