Let's roll up our sleeves and solve this. We have 710 and we're going to multiply it by 4, essentially adding 710 to itself 4 times.
Step 1: 0 + 710 = 710
Step 2: 710 + 710 = 1420
Step 3: 1420 + 710 = 2130
Step 4: 2130 + 710 = 2840

So, 710*4 = 2840