If you don't mind fractions and decimals, there's an infinite number of ways to do it. If you must have only whole numbers, then it can only be [ 1 x 23 ] or [ (-1) x (-23) ].
you multiply 8 and 15 and add to 1.53333333333 which equals 23. A simple algebretic equasion of x times 15+y=23. do opposite of operations and subtract 23 and 15 which will give you 8. Then you...