## Girly17 Group Title Find the least common denominator. Then combine. 2/9 - 2/15= 2 years ago 2 years ago

1. amistre64 Group Title

spose we set it equal to some arbitrary "n"umber

2. Girly17 Group Title

can you work it out for me please because i have to show my work and i really dont get it, thankyou

3. amistre64 Group Title

$\frac{2}{9}-\frac{2}{15}=N$ now lets just start clearing the fractions from low to high; multiply thru by 9 $\frac{2(9)}{9}-\frac{2(9)}{15}=(9)N$ $2-\frac{2(3)}{5}=9N$ now multiply thru by 5 $2(5)-\frac{2(3)(5)}{5}=9(5)N$ $2(5)-2(3)=9(5)N$ then solve for N