OK, let's crack this. We're given 348 and our task is to multiply it by 7. Essentially, we'll be adding 348 to itself 7 times.
Step 1: 0 + 348 = 348
Step 2: 348 + 348 = 696
Step 3: 696 + 348 = 1044
Step 4: 1044 + 348 = 1392
Step 5: 1392 + 348 = 1740
Step 6: 1740 + 348 = 2088
Step 7: 2088 + 348 = 2436

So, 348*7 = 2436