Sure thing, let's get straight to it. We start with 401 and we're going to multiply it by 15, which means adding 401 to itself 15 times.
Step 1: 0 + 401 = 401
Step 2: 401 + 401 = 802
Step 3: 802 + 401 = 1203
Step 4: 1203 + 401 = 1604
Step 5: 1604 + 401 = 2005
Step 6: 2005 + 401 = 2406
Step 7: 2406 + 401 = 2807
Step 8: 2807 + 401 = 3208
Step 9: 3208 + 401 = 3609
Step 10: 3609 + 401 = 4010
Step 11: 4010 + 401 = 4411
Step 12: 4411 + 401 = 4812
Step 13: 4812 + 401 = 5213
Step 14: 5213 + 401 = 5614
Step 15: 5614 + 401 = 6015

So, 401*15 = 6015