4 (Four)

Lets play. Prove it if you are really smart! Did you know? 4 ? - ? = 4 Can you solve that with time limit? You will be provided an uncomplete mathematical statement, please complete the statement to be correct statement, based on the displayed results. In that incomplete mathematical statement contains question mark (?) symbol will be blinked. You've to select correct number by tap the one of the 4 buttons to fill "?" symbol with correct number. Each button for the numbers 1, 2, 3 and 4. Beat all the player in leaderboard and you are smarter than all.