How can PHP variables be properly assigned and used in mathematical calculations?

To properly assign and use PHP variables in mathematical calculations, you need to ensure that the variables are assigned the correct values and data types before performing any mathematical operations on them. Make sure to use appropriate operators for addition, subtraction, multiplication, and division. Additionally, consider using built-in functions for more complex calculations.

// Assign variables
$num1 = 10;
$num2 = 5;

// Perform mathematical calculations
$sum = $num1 + $num2;
$diff = $num1 - $num2;
$product = $num1 * $num2;
$quotient = $num1 / $num2;

// Display results
echo "Sum: " . $sum . "<br>";
echo "Difference: " . $diff . "<br>";
echo "Product: " . $product . "<br>";
echo "Quotient: " . $quotient . "<br>";