OK, let's crack this. We're given 774 and our task is to multiply it by 39. Essentially, we'll be adding 774 to itself 39 times.
Step 1: 0 + 774 = 774
Step 2: 774 + 774 = 1548
Step 3: 1548 + 774 = 2322
Step 4: 2322 + 774 = 3096
Step 5: 3096 + 774 = 3870
Step 6: 3870 + 774 = 4644
Step 7: 4644 + 774 = 5418
Step 8: 5418 + 774 = 6192
Step 9: 6192 + 774 = 6966
Step 10: 6966 + 774 = 7740
Step 11: 7740 + 774 = 8514
Step 12: 8514 + 774 = 9288
Step 13: 9288 + 774 = 10062
Step 14: 10062 + 774 = 10836
Step 15: 10836 + 774 = 11610
Step 16: 11610 + 774 = 12384
Step 17: 12384 + 774 = 13158
Step 18: 13158 + 774 = 13932
Step 19: 13932 + 774 = 14706
Step 20: 14706 + 774 = 15480
Step 21: 15480 + 774 = 16254
Step 22: 16254 + 774 = 17028
Step 23: 17028 + 774 = 17802
Step 24: 17802 + 774 = 18576
Step 25: 18576 + 774 = 19350
Step 26: 19350 + 774 = 20124
Step 27: 20124 + 774 = 20898
Step 28: 20898 + 774 = 21672
Step 29: 21672 + 774 = 22446
Step 30: 22446 + 774 = 23220
Step 31: 23220 + 774 = 23994
Step 32: 23994 + 774 = 24768
Step 33: 24768 + 774 = 25542
Step 34: 25542 + 774 = 26316
Step 35: 26316 + 774 = 27090
Step 36: 27090 + 774 = 27864
Step 37: 27864 + 774 = 28638
Step 38: 28638 + 774 = 29412
Step 39: 29412 + 774 = 30186

So, 774*39 = 30186