Without delay, let's solve this. We've got 661 and we will be multiplying it by 7, that is, adding 661 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