Let's roll up our sleeves and solve this. We have 335 and we're going to multiply it by 4, essentially adding 335 to itself 4 times.
Step 1: 0 + 335 = 335
Step 2: 335 + 335 = 670
Step 3: 670 + 335 = 1005
Step 4: 1005 + 335 = 1340

So, 335*4 = 1340