Let's roll up our sleeves and solve this. We have 879 and we're going to multiply it by 6, essentially adding 879 to itself 6 times.
Step 1: 0 + 879 = 879
Step 2: 879 + 879 = 1758
Step 3: 1758 + 879 = 2637
Step 4: 2637 + 879 = 3516
Step 5: 3516 + 879 = 4395
Step 6: 4395 + 879 = 5274

So, 879*6 = 5274