Let's get this math done. We have 381 and we're going to multiply it by 10. This is the same as taking 381 and adding it to itself 10 times.
Step 1: 0 + 381 = 381
Step 2: 381 + 381 = 762
Step 3: 762 + 381 = 1143
Step 4: 1143 + 381 = 1524
Step 5: 1524 + 381 = 1905
Step 6: 1905 + 381 = 2286
Step 7: 2286 + 381 = 2667
Step 8: 2667 + 381 = 3048
Step 9: 3048 + 381 = 3429
Step 10: 3429 + 381 = 3810

So, 381*10 = 3810