Let's roll up our sleeves and solve this. We have 915 and we're going to multiply it by 5, essentially adding 915 to itself 5 times.
Step 1: 0 + 915 = 915
Step 2: 915 + 915 = 1830
Step 3: 1830 + 915 = 2745
Step 4: 2745 + 915 = 3660
Step 5: 3660 + 915 = 4575

So, 915*5 = 4575