fill in the missing signs to make the sum correct...........8 ? 4 ? 4=9
if the signs do not need to be limited to those indicating addition, subtraction, multiplication and division:
8^0 + 4 + 4 = 9
8^0 = 8 to the zero power = 1
Or it could be:
8 + 4/4 = 9
I hope this helps. Thanks for asking.