Alright, let's solve this math problem step by step. First, we have the number 45. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 48. So, we're going to take the number 45 and add it to itself 48 times.
Step 1: 0 + 45 = 45
Step 2: 45 + 45 = 90
Step 3: 90 + 45 = 135
Step 4: 135 + 45 = 180
Step 5: 180 + 45 = 225
Step 6: 225 + 45 = 270
Step 7: 270 + 45 = 315
Step 8: 315 + 45 = 360
Step 9: 360 + 45 = 405
Step 10: 405 + 45 = 450
Step 11: 450 + 45 = 495
Step 12: 495 + 45 = 540
Step 13: 540 + 45 = 585
Step 14: 585 + 45 = 630
Step 15: 630 + 45 = 675
Step 16: 675 + 45 = 720
Step 17: 720 + 45 = 765
Step 18: 765 + 45 = 810
Step 19: 810 + 45 = 855
Step 20: 855 + 45 = 900
Step 21: 900 + 45 = 945
Step 22: 945 + 45 = 990
Step 23: 990 + 45 = 1035
Step 24: 1035 + 45 = 1080
Step 25: 1080 + 45 = 1125
Step 26: 1125 + 45 = 1170
Step 27: 1170 + 45 = 1215
Step 28: 1215 + 45 = 1260
Step 29: 1260 + 45 = 1305
Step 30: 1305 + 45 = 1350
Step 31: 1350 + 45 = 1395
Step 32: 1395 + 45 = 1440
Step 33: 1440 + 45 = 1485
Step 34: 1485 + 45 = 1530
Step 35: 1530 + 45 = 1575
Step 36: 1575 + 45 = 1620
Step 37: 1620 + 45 = 1665
Step 38: 1665 + 45 = 1710
Step 39: 1710 + 45 = 1755
Step 40: 1755 + 45 = 1800
Step 41: 1800 + 45 = 1845
Step 42: 1845 + 45 = 1890
Step 43: 1890 + 45 = 1935
Step 44: 1935 + 45 = 1980
Step 45: 1980 + 45 = 2025
Step 46: 2025 + 45 = 2070
Step 47: 2070 + 45 = 2115
Step 48: 2115 + 45 = 2160

So, 45*48 = 2160