Let's roll up our sleeves and solve this. We have 647 and we're going to multiply it by 5, essentially adding 647 to itself 5 times.
Step 1: 0 + 647 = 647
Step 2: 647 + 647 = 1294
Step 3: 1294 + 647 = 1941
Step 4: 1941 + 647 = 2588
Step 5: 2588 + 647 = 3235

So, 647*5 = 3235