OK, let's crack this. We're given 680 and our task is to multiply it by 9. Essentially, we'll be adding 680 to itself 9 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
Step 8: 4760 + 680 = 5440
Step 9: 5440 + 680 = 6120

So, 680*9 = 6120