OK, let's crack this. We're given 25 and our task is to multiply it by 115. Essentially, we'll be adding 25 to itself 115 times.
Step 1: 0 + 25 = 25
Step 2: 25 + 25 = 50
Step 3: 50 + 25 = 75
Step 4: 75 + 25 = 100
Step 5: 100 + 25 = 125
Step 6: 125 + 25 = 150
Step 7: 150 + 25 = 175
Step 8: 175 + 25 = 200
Step 9: 200 + 25 = 225
Step 10: 225 + 25 = 250
Step 11: 250 + 25 = 275
Step 12: 275 + 25 = 300
Step 13: 300 + 25 = 325
Step 14: 325 + 25 = 350
Step 15: 350 + 25 = 375
Step 16: 375 + 25 = 400
Step 17: 400 + 25 = 425
Step 18: 425 + 25 = 450
Step 19: 450 + 25 = 475
Step 20: 475 + 25 = 500
Step 21: 500 + 25 = 525
Step 22: 525 + 25 = 550
Step 23: 550 + 25 = 575
Step 24: 575 + 25 = 600
Step 25: 600 + 25 = 625
Step 26: 625 + 25 = 650
Step 27: 650 + 25 = 675
Step 28: 675 + 25 = 700
Step 29: 700 + 25 = 725
Step 30: 725 + 25 = 750
Step 31: 750 + 25 = 775
Step 32: 775 + 25 = 800
Step 33: 800 + 25 = 825
Step 34: 825 + 25 = 850
Step 35: 850 + 25 = 875
Step 36: 875 + 25 = 900
Step 37: 900 + 25 = 925
Step 38: 925 + 25 = 950
Step 39: 950 + 25 = 975
Step 40: 975 + 25 = 1000
Step 41: 1000 + 25 = 1025
Step 42: 1025 + 25 = 1050
Step 43: 1050 + 25 = 1075
Step 44: 1075 + 25 = 1100
Step 45: 1100 + 25 = 1125
Step 46: 1125 + 25 = 1150
Step 47: 1150 + 25 = 1175
Step 48: 1175 + 25 = 1200
Step 49: 1200 + 25 = 1225
Step 50: 1225 + 25 = 1250
Step 51: 1250 + 25 = 1275
Step 52: 1275 + 25 = 1300
Step 53: 1300 + 25 = 1325
Step 54: 1325 + 25 = 1350
Step 55: 1350 + 25 = 1375
Step 56: 1375 + 25 = 1400
Step 57: 1400 + 25 = 1425
Step 58: 1425 + 25 = 1450
Step 59: 1450 + 25 = 1475
Step 60: 1475 + 25 = 1500
Step 61: 1500 + 25 = 1525
Step 62: 1525 + 25 = 1550
Step 63: 1550 + 25 = 1575
Step 64: 1575 + 25 = 1600
Step 65: 1600 + 25 = 1625
Step 66: 1625 + 25 = 1650
Step 67: 1650 + 25 = 1675
Step 68: 1675 + 25 = 1700
Step 69: 1700 + 25 = 1725
Step 70: 1725 + 25 = 1750
Step 71: 1750 + 25 = 1775
Step 72: 1775 + 25 = 1800
Step 73: 1800 + 25 = 1825
Step 74: 1825 + 25 = 1850
Step 75: 1850 + 25 = 1875
Step 76: 1875 + 25 = 1900
Step 77: 1900 + 25 = 1925
Step 78: 1925 + 25 = 1950
Step 79: 1950 + 25 = 1975
Step 80: 1975 + 25 = 2000
Step 81: 2000 + 25 = 2025
Step 82: 2025 + 25 = 2050
Step 83: 2050 + 25 = 2075
Step 84: 2075 + 25 = 2100
Step 85: 2100 + 25 = 2125
Step 86: 2125 + 25 = 2150
Step 87: 2150 + 25 = 2175
Step 88: 2175 + 25 = 2200
Step 89: 2200 + 25 = 2225
Step 90: 2225 + 25 = 2250
Step 91: 2250 + 25 = 2275
Step 92: 2275 + 25 = 2300
Step 93: 2300 + 25 = 2325
Step 94: 2325 + 25 = 2350
Step 95: 2350 + 25 = 2375
Step 96: 2375 + 25 = 2400
Step 97: 2400 + 25 = 2425
Step 98: 2425 + 25 = 2450
Step 99: 2450 + 25 = 2475
Step 100: 2475 + 25 = 2500
Step 101: 2500 + 25 = 2525
Step 102: 2525 + 25 = 2550
Step 103: 2550 + 25 = 2575
Step 104: 2575 + 25 = 2600
Step 105: 2600 + 25 = 2625
Step 106: 2625 + 25 = 2650
Step 107: 2650 + 25 = 2675
Step 108: 2675 + 25 = 2700
Step 109: 2700 + 25 = 2725
Step 110: 2725 + 25 = 2750
Step 111: 2750 + 25 = 2775
Step 112: 2775 + 25 = 2800
Step 113: 2800 + 25 = 2825
Step 114: 2825 + 25 = 2850
Step 115: 2850 + 25 = 2875

So, 25*115 = 2875