Let's roll up our sleeves and solve this. We have 491 and we're going to multiply it by 39, essentially adding 491 to itself 39 times.
Step 1: 0 + 491 = 491
Step 2: 491 + 491 = 982
Step 3: 982 + 491 = 1473
Step 4: 1473 + 491 = 1964
Step 5: 1964 + 491 = 2455
Step 6: 2455 + 491 = 2946
Step 7: 2946 + 491 = 3437
Step 8: 3437 + 491 = 3928
Step 9: 3928 + 491 = 4419
Step 10: 4419 + 491 = 4910
Step 11: 4910 + 491 = 5401
Step 12: 5401 + 491 = 5892
Step 13: 5892 + 491 = 6383
Step 14: 6383 + 491 = 6874
Step 15: 6874 + 491 = 7365
Step 16: 7365 + 491 = 7856
Step 17: 7856 + 491 = 8347
Step 18: 8347 + 491 = 8838
Step 19: 8838 + 491 = 9329
Step 20: 9329 + 491 = 9820
Step 21: 9820 + 491 = 10311
Step 22: 10311 + 491 = 10802
Step 23: 10802 + 491 = 11293
Step 24: 11293 + 491 = 11784
Step 25: 11784 + 491 = 12275
Step 26: 12275 + 491 = 12766
Step 27: 12766 + 491 = 13257
Step 28: 13257 + 491 = 13748
Step 29: 13748 + 491 = 14239
Step 30: 14239 + 491 = 14730
Step 31: 14730 + 491 = 15221
Step 32: 15221 + 491 = 15712
Step 33: 15712 + 491 = 16203
Step 34: 16203 + 491 = 16694
Step 35: 16694 + 491 = 17185
Step 36: 17185 + 491 = 17676
Step 37: 17676 + 491 = 18167
Step 38: 18167 + 491 = 18658
Step 39: 18658 + 491 = 19149

So, 491*39 = 19149