OK, let's work through this together. We're starting with 458 and we're going to multiply it by 7, which means we add 458 to itself 7 times.
Step 1: 0 + 458 = 458
Step 2: 458 + 458 = 916
Step 3: 916 + 458 = 1374
Step 4: 1374 + 458 = 1832
Step 5: 1832 + 458 = 2290
Step 6: 2290 + 458 = 2748
Step 7: 2748 + 458 = 3206

So, 458*7 = 3206