Let's get this math done. We have 199 and we're going to multiply it by 10. This is the same as taking 199 and adding it to itself 10 times.
Step 1: 0 + 199 = 199
Step 2: 199 + 199 = 398
Step 3: 398 + 199 = 597
Step 4: 597 + 199 = 796
Step 5: 796 + 199 = 995
Step 6: 995 + 199 = 1194
Step 7: 1194 + 199 = 1393
Step 8: 1393 + 199 = 1592
Step 9: 1592 + 199 = 1791
Step 10: 1791 + 199 = 1990

So, 199*10 = 1990