Let's roll up our sleeves and solve this. We have 617 and we're going to multiply it by 27, essentially adding 617 to itself 27 times.
Step 1: 0 + 617 = 617
Step 2: 617 + 617 = 1234
Step 3: 1234 + 617 = 1851
Step 4: 1851 + 617 = 2468
Step 5: 2468 + 617 = 3085
Step 6: 3085 + 617 = 3702
Step 7: 3702 + 617 = 4319
Step 8: 4319 + 617 = 4936
Step 9: 4936 + 617 = 5553
Step 10: 5553 + 617 = 6170
Step 11: 6170 + 617 = 6787
Step 12: 6787 + 617 = 7404
Step 13: 7404 + 617 = 8021
Step 14: 8021 + 617 = 8638
Step 15: 8638 + 617 = 9255
Step 16: 9255 + 617 = 9872
Step 17: 9872 + 617 = 10489
Step 18: 10489 + 617 = 11106
Step 19: 11106 + 617 = 11723
Step 20: 11723 + 617 = 12340
Step 21: 12340 + 617 = 12957
Step 22: 12957 + 617 = 13574
Step 23: 13574 + 617 = 14191
Step 24: 14191 + 617 = 14808
Step 25: 14808 + 617 = 15425
Step 26: 15425 + 617 = 16042
Step 27: 16042 + 617 = 16659

So, 617*27 = 16659