Alright, let's solve this math problem step by step. First, we have the number 800. 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 800 and add it to itself 45 times.
Step 1: 0 + 800 = 800
Step 2: 800 + 800 = 1600
Step 3: 1600 + 800 = 2400
Step 4: 2400 + 800 = 3200
Step 5: 3200 + 800 = 4000
Step 6: 4000 + 800 = 4800
Step 7: 4800 + 800 = 5600
Step 8: 5600 + 800 = 6400
Step 9: 6400 + 800 = 7200
Step 10: 7200 + 800 = 8000
Step 11: 8000 + 800 = 8800
Step 12: 8800 + 800 = 9600
Step 13: 9600 + 800 = 10400
Step 14: 10400 + 800 = 11200
Step 15: 11200 + 800 = 12000
Step 16: 12000 + 800 = 12800
Step 17: 12800 + 800 = 13600
Step 18: 13600 + 800 = 14400
Step 19: 14400 + 800 = 15200
Step 20: 15200 + 800 = 16000
Step 21: 16000 + 800 = 16800
Step 22: 16800 + 800 = 17600
Step 23: 17600 + 800 = 18400
Step 24: 18400 + 800 = 19200
Step 25: 19200 + 800 = 20000
Step 26: 20000 + 800 = 20800
Step 27: 20800 + 800 = 21600
Step 28: 21600 + 800 = 22400
Step 29: 22400 + 800 = 23200
Step 30: 23200 + 800 = 24000
Step 31: 24000 + 800 = 24800
Step 32: 24800 + 800 = 25600
Step 33: 25600 + 800 = 26400
Step 34: 26400 + 800 = 27200
Step 35: 27200 + 800 = 28000
Step 36: 28000 + 800 = 28800
Step 37: 28800 + 800 = 29600
Step 38: 29600 + 800 = 30400
Step 39: 30400 + 800 = 31200
Step 40: 31200 + 800 = 32000
Step 41: 32000 + 800 = 32800
Step 42: 32800 + 800 = 33600
Step 43: 33600 + 800 = 34400
Step 44: 34400 + 800 = 35200
Step 45: 35200 + 800 = 36000

So, 800*45 = 36000