Question 1108632
{{{72=9*8=9*2*2*2}}} and {{{90=9*10=9*2*5}}}
Both numbers have
{{{9*2=18}}} as a factor
{{{72=(9*2)*(2*2)=18*4}}} and {{{90=(9*2)*5=18*5}}} .
Dominic should cut strips {{{highlight(18)}}} inches wide.
He will get 4 strips out of the piece that is 72 inches wide,
and 5 strips out of the piece that is 90 inches wide.