OK, let's crack this. We're given 154 and our task is to multiply it by 10. Essentially, we'll be adding 154 to itself 10 times.
Step 1: 0 + 154 = 154
Step 2: 154 + 154 = 308
Step 3: 308 + 154 = 462
Step 4: 462 + 154 = 616
Step 5: 616 + 154 = 770
Step 6: 770 + 154 = 924
Step 7: 924 + 154 = 1078
Step 8: 1078 + 154 = 1232
Step 9: 1232 + 154 = 1386
Step 10: 1386 + 154 = 1540

So, 154*10 = 1540