Write four and one fifth as an improper fraction
To write four and one-fifth as an improper fraction, we need to first convert the mixed number (four and one-fifth) into a fraction form.
To do this, we multiply the whole number (four) by the denominator of the fraction (5) and add the numerator (one).
4 * 5 + 1 = 20 + 1 = 21
Then, we put the result over the denominator:
21/5
Therefore, four and one-fifth written as an improper fraction is 21/5.