Little Maths riddle supposedly for 12 year olds!?

Starstruckhigh

New member
Ok the teacher wrote his on the board today

f4e s9_

She asked us the missing number ( the line signifies a space like this _ ) . She said it was very easy and that we will kick ourselves when we hear the answer, no-one could get it so we got it for homework! Anyway do you know what it is? She says we have to explain it too, she said it's way more simple than you would think? Thanks , please can you get back to me SOON as possible!
 
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