This means that there is no number, except 1, that can be divided evenly into both the numerator and the denominator. To reduce a fraction to lowest terms, divide the numerator and denominator by their Greatest Common Factor (GCF). This is also called simplifying the fraction.
Hope this helped
Explanation:
I don't really get the first part but heres 2nd part.
2. nueve IV + V = IX
3. dos VIII - VI = II
4. diez III + VII = X
5. cuatro VI - II = IV
6. ocho IX - I = VIII
7. seis II × III = VI
8. sinco X ÷ II = V