OK, let's crack this. We're given 451 and our task is to multiply it by 10. Essentially, we'll be adding 451 to itself 10 times.
Step 1: 0 + 451 = 451
Step 2: 451 + 451 = 902
Step 3: 902 + 451 = 1353
Step 4: 1353 + 451 = 1804
Step 5: 1804 + 451 = 2255
Step 6: 2255 + 451 = 2706
Step 7: 2706 + 451 = 3157
Step 8: 3157 + 451 = 3608
Step 9: 3608 + 451 = 4059
Step 10: 4059 + 451 = 4510

So, 451*10 = 4510