Before we can evaluate a sum or difference involving mixed numbers, the mixed numbers must first be rewritten as fractions.
a bc
a* c+b/c
Simplify
7 34
7* 4+3/4
31/4
-8 12
-(8* 2+1/2)
-17/2
When adding or subtracting fractions they should have the same denominator. In this exercise, we have two fractions with different denominators.
31/4 + (-17/2)
Since 4 is a multiple of 2, we can multiply both the numerator and denominator of - 172 by 2 to create a common denominator.
