Let's get this math done. We have 661 and we're going to multiply it by 7. This is the same as taking 661 and adding it to itself 7 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
Step 6: 3305 + 661 = 3966
Step 7: 3966 + 661 = 4627

So, 661*7 = 4627