Without delay, let's solve this. We've got 680 and we will be multiplying it by 7, that is, adding 680 to itself 7 times.
Step 1: 0 + 680 = 680
Step 2: 680 + 680 = 1360
Step 3: 1360 + 680 = 2040
Step 4: 2040 + 680 = 2720
Step 5: 2720 + 680 = 3400
Step 6: 3400 + 680 = 4080
Step 7: 4080 + 680 = 4760

So, 680*7 = 4760