Mixed number to improper fraction: (Whole x Denominator) + Numerator, keep the Denominator

Whole	=	2
Denominator	=	4
Numerator	=	1
Multiply the whole number by the denominator: 2 x 4 = 8. Then add the numerator: 8 + 1 = 9.
Improper fraction	=	\(\dfrac{9}{4}\)