Divide:
$$ 117.6 \quad by \quad 21 $$
Perform the division by considering the dividend a whole number.
When the division of whole-part of the dividend is complete, put the decimal point in the quotient and proceed with the division as in case of whole numbers.
we have,
$$ 117.6 \div 21 $$
$$ \therefore 117.6 \div 21 = 5.6 $$