Alright, let's solve this math problem step by step. First, we have the number 340. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 39. So, we're going to take the number 340 and add it to itself 39 times.
Step 1: 0 + 340 = 340
Step 2: 340 + 340 = 680
Step 3: 680 + 340 = 1020
Step 4: 1020 + 340 = 1360
Step 5: 1360 + 340 = 1700
Step 6: 1700 + 340 = 2040
Step 7: 2040 + 340 = 2380
Step 8: 2380 + 340 = 2720
Step 9: 2720 + 340 = 3060
Step 10: 3060 + 340 = 3400
Step 11: 3400 + 340 = 3740
Step 12: 3740 + 340 = 4080
Step 13: 4080 + 340 = 4420
Step 14: 4420 + 340 = 4760
Step 15: 4760 + 340 = 5100
Step 16: 5100 + 340 = 5440
Step 17: 5440 + 340 = 5780
Step 18: 5780 + 340 = 6120
Step 19: 6120 + 340 = 6460
Step 20: 6460 + 340 = 6800
Step 21: 6800 + 340 = 7140
Step 22: 7140 + 340 = 7480
Step 23: 7480 + 340 = 7820
Step 24: 7820 + 340 = 8160
Step 25: 8160 + 340 = 8500
Step 26: 8500 + 340 = 8840
Step 27: 8840 + 340 = 9180
Step 28: 9180 + 340 = 9520
Step 29: 9520 + 340 = 9860
Step 30: 9860 + 340 = 10200
Step 31: 10200 + 340 = 10540
Step 32: 10540 + 340 = 10880
Step 33: 10880 + 340 = 11220
Step 34: 11220 + 340 = 11560
Step 35: 11560 + 340 = 11900
Step 36: 11900 + 340 = 12240
Step 37: 12240 + 340 = 12580
Step 38: 12580 + 340 = 12920
Step 39: 12920 + 340 = 13260

So, 340*39 = 13260