Change the mixed number 13 and five sixths13 5 6 to an improper fraction.

Multiply the 6 (the denominator), and the 13 (the whole number). To this product, add the 5 (the numerator).

It then gives you 83, which is now the numerator for the improper fraction, and use the 6 as the denominator for the improper fraction.

Therefore the mixed number (13 6/5) is now 83/6 written as an improper fraction.