OK, let's work through this together. We're starting with 858 and we're going to multiply it by 5, which means we add 858 to itself 5 times.
Step 1: 0 + 858 = 858
Step 2: 858 + 858 = 1716
Step 3: 1716 + 858 = 2574
Step 4: 2574 + 858 = 3432
Step 5: 3432 + 858 = 4290

So, 858*5 = 4290