Alright, let's solve this math problem step by step. First, we have the number 392. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 45. So, we're going to take the number 392 and add it to itself 45 times.
Step 1: 0 + 392 = 392
Step 2: 392 + 392 = 784
Step 3: 784 + 392 = 1176
Step 4: 1176 + 392 = 1568
Step 5: 1568 + 392 = 1960
Step 6: 1960 + 392 = 2352
Step 7: 2352 + 392 = 2744
Step 8: 2744 + 392 = 3136
Step 9: 3136 + 392 = 3528
Step 10: 3528 + 392 = 3920
Step 11: 3920 + 392 = 4312
Step 12: 4312 + 392 = 4704
Step 13: 4704 + 392 = 5096
Step 14: 5096 + 392 = 5488
Step 15: 5488 + 392 = 5880
Step 16: 5880 + 392 = 6272
Step 17: 6272 + 392 = 6664
Step 18: 6664 + 392 = 7056
Step 19: 7056 + 392 = 7448
Step 20: 7448 + 392 = 7840
Step 21: 7840 + 392 = 8232
Step 22: 8232 + 392 = 8624
Step 23: 8624 + 392 = 9016
Step 24: 9016 + 392 = 9408
Step 25: 9408 + 392 = 9800
Step 26: 9800 + 392 = 10192
Step 27: 10192 + 392 = 10584
Step 28: 10584 + 392 = 10976
Step 29: 10976 + 392 = 11368
Step 30: 11368 + 392 = 11760
Step 31: 11760 + 392 = 12152
Step 32: 12152 + 392 = 12544
Step 33: 12544 + 392 = 12936
Step 34: 12936 + 392 = 13328
Step 35: 13328 + 392 = 13720
Step 36: 13720 + 392 = 14112
Step 37: 14112 + 392 = 14504
Step 38: 14504 + 392 = 14896
Step 39: 14896 + 392 = 15288
Step 40: 15288 + 392 = 15680
Step 41: 15680 + 392 = 16072
Step 42: 16072 + 392 = 16464
Step 43: 16464 + 392 = 16856
Step 44: 16856 + 392 = 17248
Step 45: 17248 + 392 = 17640

So, 392*45 = 17640