OK, let's work through this together. We're starting with 745 and we're going to multiply it by 3, which means we add 745 to itself 3 times.
Step 1: 0 + 745 = 745
Step 2: 745 + 745 = 1490
Step 3: 1490 + 745 = 2235

So, 745*3 = 2235