OK, let's crack this. We're given 458 and our task is to multiply it by 30. Essentially, we'll be adding 458 to itself 30 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
Step 8: 3206 + 458 = 3664
Step 9: 3664 + 458 = 4122
Step 10: 4122 + 458 = 4580
Step 11: 4580 + 458 = 5038
Step 12: 5038 + 458 = 5496
Step 13: 5496 + 458 = 5954
Step 14: 5954 + 458 = 6412
Step 15: 6412 + 458 = 6870
Step 16: 6870 + 458 = 7328
Step 17: 7328 + 458 = 7786
Step 18: 7786 + 458 = 8244
Step 19: 8244 + 458 = 8702
Step 20: 8702 + 458 = 9160
Step 21: 9160 + 458 = 9618
Step 22: 9618 + 458 = 10076
Step 23: 10076 + 458 = 10534
Step 24: 10534 + 458 = 10992
Step 25: 10992 + 458 = 11450
Step 26: 11450 + 458 = 11908
Step 27: 11908 + 458 = 12366
Step 28: 12366 + 458 = 12824
Step 29: 12824 + 458 = 13282
Step 30: 13282 + 458 = 13740

So, 458*30 = 13740