Let's roll up our sleeves and solve this. We have 836 and we're going to multiply it by 4, essentially adding 836 to itself 4 times.
Step 1: 0 + 836 = 836
Step 2: 836 + 836 = 1672
Step 3: 1672 + 836 = 2508
Step 4: 2508 + 836 = 3344

So, 836*4 = 3344