Let's get this math done. We have 690 and we're going to multiply it by 4. This is the same as taking 690 and adding it to itself 4 times.
Step 1: 0 + 690 = 690
Step 2: 690 + 690 = 1380
Step 3: 1380 + 690 = 2070
Step 4: 2070 + 690 = 2760

So, 690*4 = 2760