OK, let's work through this together. We're starting with 661 and we're going to multiply it by 5, which means we add 661 to itself 5 times.
Step 1: 0 + 661 = 661
Step 2: 661 + 661 = 1322
Step 3: 1322 + 661 = 1983
Step 4: 1983 + 661 = 2644
Step 5: 2644 + 661 = 3305

So, 661*5 = 3305