you don't, 5-2=3 not 4
You take the F,& E from FIVE = Roman numeral IV =4
-4
You take 4 times 5 which is 20 then 3 plus 2 which is 5. Add 20 plus 5 and you get 25. That's the answer.
2 ÷ 4/5 = 5/2 or 21/2
5!=5*4*3*2*1
it would take 8 2's and 5 4's to build it.