OK, let's work through this together. We're starting with 68 and we're going to multiply it by 7, which means we add 68 to itself 7 times.
Step 1: 0 + 68 = 68
Step 2: 68 + 68 = 136
Step 3: 136 + 68 = 204
Step 4: 204 + 68 = 272
Step 5: 272 + 68 = 340
Step 6: 340 + 68 = 408
Step 7: 408 + 68 = 476

So, 68*7 = 476