Which of the following is/are true about the properties of whole numbers?

Jyothi in her workbook has calculated the value of $64\times 25$, in three different ways. However she left her work incomplete without filling in the final answer.

$\left(i\right) 64\times 25=(60+4)\times 25=60\times 25+4\times 25=\_\_\_\_\_\_$

$\left(ii\right) 64\times 25=\frac{64\times 100}{4}=\frac{6400}{4}=\_\_\_\_$

$\left(iii\right)$ $64\times 25=\_\_\_ \times \_\_\_$

Which of the following gives the same value as $64\times 25$?

A teacher gave the problem below to the students of a class and announced a gift to the student who solves it first.

$4378+998=\_\_\_$

A student gave the answer almost immediately. Which of the following numerical expression gives the value as the sum of the numbers above?