There are infinitely many possible answers.
40*1
40*1*1
40*1*1*1
and so on.
400*0.1
400*0.1*1
400*0.1*1*1 etc
and then
4000*0.1*0.1
4000*0.1*0.1*1
or
4000*0.01
etc
And then there are irrationals
20*sqrt(2)*sqrt(2)
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60
100*40
20 and 20
80
1*40 2*40 4*10 5*8