Let's roll up our sleeves and solve this. We have 846 and we're going to multiply it by 4, essentially adding 846 to itself 4 times.
Step 1: 0 + 846 = 846
Step 2: 846 + 846 = 1692
Step 3: 1692 + 846 = 2538
Step 4: 2538 + 846 = 3384

So, 846*4 = 3384