Question

State true or false.

If square of a number ends with 5, then its cube ends with 25.

Options

• True

• False

Answer 1

For finding the cube of any number, the number is first multiplied with itself and this product is again multiplied with this number.

False. It is not always necessary that if the square of a number ends with 5, then its cube will end with 25.

For example, the square of 25 is 625 and 625 has its unit digit as 5. The cube of 25 is 15625. However, the square of 35 is 1225 and also has its unit place digit as 5 but the cube of 35 is 42875 which does not end with 25.