OK, let's work through this together. We're starting with 828 and we're going to multiply it by 5, which means we add 828 to itself 5 times.
Step 1: 0 + 828 = 828
Step 2: 828 + 828 = 1656
Step 3: 1656 + 828 = 2484
Step 4: 2484 + 828 = 3312
Step 5: 3312 + 828 = 4140

So, 828*5 = 4140