OK, let's crack this. We're given 42 and our task is to multiply it by 7. Essentially, we'll be adding 42 to itself 7 times.
Step 1: 0 + 42 = 42
Step 2: 42 + 42 = 84
Step 3: 84 + 42 = 126
Step 4: 126 + 42 = 168
Step 5: 168 + 42 = 210
Step 6: 210 + 42 = 252
Step 7: 252 + 42 = 294

So, 42*7 = 294