Question

Which is a not a common factor for 90 and 180 ?

Answer 1

180

Answer 2

15,30,45,60

Answer 3

\[15\times4=90,\quad 15\times8=180\]\[30\times3=90,\quad 30\times6=180\]\[45\times2=90,\quad 45\times4=180\]

Answer 4

60, thanks ur

Answer 5

that's right
\[60\times\frac 3 2=90,\quad60\times3=180\],
but 3/2 cannot be a factor because it is not a whole number