OK, let's crack this. We're given 50 and our task is to multiply it by 72. Essentially, we'll be adding 50 to itself 72 times.
Step 1: 0 + 50 = 50
Step 2: 50 + 50 = 100
Step 3: 100 + 50 = 150
Step 4: 150 + 50 = 200
Step 5: 200 + 50 = 250
Step 6: 250 + 50 = 300
Step 7: 300 + 50 = 350
Step 8: 350 + 50 = 400
Step 9: 400 + 50 = 450
Step 10: 450 + 50 = 500
Step 11: 500 + 50 = 550
Step 12: 550 + 50 = 600
Step 13: 600 + 50 = 650
Step 14: 650 + 50 = 700
Step 15: 700 + 50 = 750
Step 16: 750 + 50 = 800
Step 17: 800 + 50 = 850
Step 18: 850 + 50 = 900
Step 19: 900 + 50 = 950
Step 20: 950 + 50 = 1000
Step 21: 1000 + 50 = 1050
Step 22: 1050 + 50 = 1100
Step 23: 1100 + 50 = 1150
Step 24: 1150 + 50 = 1200
Step 25: 1200 + 50 = 1250
Step 26: 1250 + 50 = 1300
Step 27: 1300 + 50 = 1350
Step 28: 1350 + 50 = 1400
Step 29: 1400 + 50 = 1450
Step 30: 1450 + 50 = 1500
Step 31: 1500 + 50 = 1550
Step 32: 1550 + 50 = 1600
Step 33: 1600 + 50 = 1650
Step 34: 1650 + 50 = 1700
Step 35: 1700 + 50 = 1750
Step 36: 1750 + 50 = 1800
Step 37: 1800 + 50 = 1850
Step 38: 1850 + 50 = 1900
Step 39: 1900 + 50 = 1950
Step 40: 1950 + 50 = 2000
Step 41: 2000 + 50 = 2050
Step 42: 2050 + 50 = 2100
Step 43: 2100 + 50 = 2150
Step 44: 2150 + 50 = 2200
Step 45: 2200 + 50 = 2250
Step 46: 2250 + 50 = 2300
Step 47: 2300 + 50 = 2350
Step 48: 2350 + 50 = 2400
Step 49: 2400 + 50 = 2450
Step 50: 2450 + 50 = 2500
Step 51: 2500 + 50 = 2550
Step 52: 2550 + 50 = 2600
Step 53: 2600 + 50 = 2650
Step 54: 2650 + 50 = 2700
Step 55: 2700 + 50 = 2750
Step 56: 2750 + 50 = 2800
Step 57: 2800 + 50 = 2850
Step 58: 2850 + 50 = 2900
Step 59: 2900 + 50 = 2950
Step 60: 2950 + 50 = 3000
Step 61: 3000 + 50 = 3050
Step 62: 3050 + 50 = 3100
Step 63: 3100 + 50 = 3150
Step 64: 3150 + 50 = 3200
Step 65: 3200 + 50 = 3250
Step 66: 3250 + 50 = 3300
Step 67: 3300 + 50 = 3350
Step 68: 3350 + 50 = 3400
Step 69: 3400 + 50 = 3450
Step 70: 3450 + 50 = 3500
Step 71: 3500 + 50 = 3550
Step 72: 3550 + 50 = 3600

So, 50*72 = 3600