OK, let's work through this together. We're starting with 486 and we're going to multiply it by 10, which means we add 486 to itself 10 times.
Step 1: 0 + 486 = 486
Step 2: 486 + 486 = 972
Step 3: 972 + 486 = 1458
Step 4: 1458 + 486 = 1944
Step 5: 1944 + 486 = 2430
Step 6: 2430 + 486 = 2916
Step 7: 2916 + 486 = 3402
Step 8: 3402 + 486 = 3888
Step 9: 3888 + 486 = 4374
Step 10: 4374 + 486 = 4860

So, 486*10 = 4860