Sure thing! We've got 915 and we're gonna multiply it by 4. That's the same as adding 915 to itself 4 times.
Step 1: 0 + 915 = 915
Step 2: 915 + 915 = 1830
Step 3: 1830 + 915 = 2745
Step 4: 2745 + 915 = 3660

So, 915*4 = 3660