Alright, let's solve this math problem step by step. First, we have the number 39. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 85. So, we're going to take the number 39 and add it to itself 85 times.
Step 1: 0 + 39 = 39
Step 2: 39 + 39 = 78
Step 3: 78 + 39 = 117
Step 4: 117 + 39 = 156
Step 5: 156 + 39 = 195
Step 6: 195 + 39 = 234
Step 7: 234 + 39 = 273
Step 8: 273 + 39 = 312
Step 9: 312 + 39 = 351
Step 10: 351 + 39 = 390
Step 11: 390 + 39 = 429
Step 12: 429 + 39 = 468
Step 13: 468 + 39 = 507
Step 14: 507 + 39 = 546
Step 15: 546 + 39 = 585
Step 16: 585 + 39 = 624
Step 17: 624 + 39 = 663
Step 18: 663 + 39 = 702
Step 19: 702 + 39 = 741
Step 20: 741 + 39 = 780
Step 21: 780 + 39 = 819
Step 22: 819 + 39 = 858
Step 23: 858 + 39 = 897
Step 24: 897 + 39 = 936
Step 25: 936 + 39 = 975
Step 26: 975 + 39 = 1014
Step 27: 1014 + 39 = 1053
Step 28: 1053 + 39 = 1092
Step 29: 1092 + 39 = 1131
Step 30: 1131 + 39 = 1170
Step 31: 1170 + 39 = 1209
Step 32: 1209 + 39 = 1248
Step 33: 1248 + 39 = 1287
Step 34: 1287 + 39 = 1326
Step 35: 1326 + 39 = 1365
Step 36: 1365 + 39 = 1404
Step 37: 1404 + 39 = 1443
Step 38: 1443 + 39 = 1482
Step 39: 1482 + 39 = 1521
Step 40: 1521 + 39 = 1560
Step 41: 1560 + 39 = 1599
Step 42: 1599 + 39 = 1638
Step 43: 1638 + 39 = 1677
Step 44: 1677 + 39 = 1716
Step 45: 1716 + 39 = 1755
Step 46: 1755 + 39 = 1794
Step 47: 1794 + 39 = 1833
Step 48: 1833 + 39 = 1872
Step 49: 1872 + 39 = 1911
Step 50: 1911 + 39 = 1950
Step 51: 1950 + 39 = 1989
Step 52: 1989 + 39 = 2028
Step 53: 2028 + 39 = 2067
Step 54: 2067 + 39 = 2106
Step 55: 2106 + 39 = 2145
Step 56: 2145 + 39 = 2184
Step 57: 2184 + 39 = 2223
Step 58: 2223 + 39 = 2262
Step 59: 2262 + 39 = 2301
Step 60: 2301 + 39 = 2340
Step 61: 2340 + 39 = 2379
Step 62: 2379 + 39 = 2418
Step 63: 2418 + 39 = 2457
Step 64: 2457 + 39 = 2496
Step 65: 2496 + 39 = 2535
Step 66: 2535 + 39 = 2574
Step 67: 2574 + 39 = 2613
Step 68: 2613 + 39 = 2652
Step 69: 2652 + 39 = 2691
Step 70: 2691 + 39 = 2730
Step 71: 2730 + 39 = 2769
Step 72: 2769 + 39 = 2808
Step 73: 2808 + 39 = 2847
Step 74: 2847 + 39 = 2886
Step 75: 2886 + 39 = 2925
Step 76: 2925 + 39 = 2964
Step 77: 2964 + 39 = 3003
Step 78: 3003 + 39 = 3042
Step 79: 3042 + 39 = 3081
Step 80: 3081 + 39 = 3120
Step 81: 3120 + 39 = 3159
Step 82: 3159 + 39 = 3198
Step 83: 3198 + 39 = 3237
Step 84: 3237 + 39 = 3276
Step 85: 3276 + 39 = 3315

So, 39*85 = 3315