Let's roll up our sleeves and solve this. We have 724 and we're going to multiply it by 5, essentially adding 724 to itself 5 times.
Step 1: 0 + 724 = 724
Step 2: 724 + 724 = 1448
Step 3: 1448 + 724 = 2172
Step 4: 2172 + 724 = 2896
Step 5: 2896 + 724 = 3620

So, 724*5 = 3620