Let's roll up our sleeves and solve this. We have 34 and we're going to multiply it by 34, essentially adding 34 to itself 34 times.
Step 1: 0 + 34 = 34
Step 2: 34 + 34 = 68
Step 3: 68 + 34 = 102
Step 4: 102 + 34 = 136
Step 5: 136 + 34 = 170
Step 6: 170 + 34 = 204
Step 7: 204 + 34 = 238
Step 8: 238 + 34 = 272
Step 9: 272 + 34 = 306
Step 10: 306 + 34 = 340
Step 11: 340 + 34 = 374
Step 12: 374 + 34 = 408
Step 13: 408 + 34 = 442
Step 14: 442 + 34 = 476
Step 15: 476 + 34 = 510
Step 16: 510 + 34 = 544
Step 17: 544 + 34 = 578
Step 18: 578 + 34 = 612
Step 19: 612 + 34 = 646
Step 20: 646 + 34 = 680
Step 21: 680 + 34 = 714
Step 22: 714 + 34 = 748
Step 23: 748 + 34 = 782
Step 24: 782 + 34 = 816
Step 25: 816 + 34 = 850
Step 26: 850 + 34 = 884
Step 27: 884 + 34 = 918
Step 28: 918 + 34 = 952
Step 29: 952 + 34 = 986
Step 30: 986 + 34 = 1020
Step 31: 1020 + 34 = 1054
Step 32: 1054 + 34 = 1088
Step 33: 1088 + 34 = 1122
Step 34: 1122 + 34 = 1156

So, 34*34 = 1156