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What did I wrong?
It always shows: Bummer! Are you sure you multiplied right?
<?php //Place your code below this comment $integerOne = 1; $integerTwo = 2; $integerOne = 1 + 5; $integerTwo = 2 - 1; $floatOne = 1.5; var_dump($integerOne * $floatOne); ?>
There is nothing wrong with your code, you are just simply using var_dump instead of echo to print to the screen.
When you are trying to find some hidden information such as values inside a $_POST variable or database then I would use var_dump() however for printing things to the screen which is the case here, then use echo