Mathematics for IGCSE & O level - The Four Operations (Section 5 - No. 31)
In the expression 2 1/2 - 1 1/4, what is the common denominator if you convert the mixed numbers?
2
4
8
16
Uitleg
The common denominator will be 4 because 2 1/2 = 5/2 and 1 1/4 = 5/4.