Let's roll up our sleeves and solve this. We have 535 and we're going to multiply it by 4, essentially adding 535 to itself 4 times.
Step 1: 0 + 535 = 535
Step 2: 535 + 535 = 1070
Step 3: 1070 + 535 = 1605
Step 4: 1605 + 535 = 2140

So, 535*4 = 2140