Why is 4x9 equal 9x4?

The equality (4 \times 9 = 9 \times 4) is due to the commutative property of multiplication, which states that the order of factors does not affect the product. This means that whether you multiply 4 by 9 or 9 by 4, the result will be the same: both equal 36. This property holds true for all real numbers.