Let's roll up our sleeves and solve this. We have 506 and we're going to multiply it by 7, essentially adding 506 to itself 7 times.
Step 1: 0 + 506 = 506
Step 2: 506 + 506 = 1012
Step 3: 1012 + 506 = 1518
Step 4: 1518 + 506 = 2024
Step 5: 2024 + 506 = 2530
Step 6: 2530 + 506 = 3036
Step 7: 3036 + 506 = 3542

So, 506*7 = 3542