OK, let's crack this. We're given 458 and our task is to multiply it by 3. Essentially, we'll be adding 458 to itself 3 times.
Step 1: 0 + 458 = 458
Step 2: 458 + 458 = 916
Step 3: 916 + 458 = 1374

So, 458*3 = 1374