Simplify the operation
Reduce (simplify) the fractions to their lowest terms equivalents:
- To reduce a fraction to the lowest terms equivalent: divide both the numerator and denominator by their greatest common factor, GCF.
The fraction: - 38/38
- 38/38 = - (38 ÷ 38)/(38 ÷ 38) = - 1/1 = - 1
The fraction: - 48/42
- The prime factorizations of the numerator and denominator:
- 48 = 24 × 3
- 42 = 2 × 3 × 7
- Multiply all the common prime factors: if there are repeating prime factors we only take them once, and only the ones having the lowest exponent (the lowest powers).
- GCF (48; 42) = 2 × 3 = 6
- 48/42 = - (48 ÷ 6)/(42 ÷ 6) = - 8/7
The fraction can also be reduced without calculating GCF; factor the numerator and denominator and cross out all the common prime factors:
- 48/42 = - (24 × 3)/(2 × 3 × 7) = - ((24 × 3) ÷ (2 × 3))/((2 × 3 × 7) ÷ (2 × 3)) = - 8/7