OK, let's crack this. We're given 725 and our task is to multiply it by 24. Essentially, we'll be adding 725 to itself 24 times.
Step 1: 0 + 725 = 725
Step 2: 725 + 725 = 1450
Step 3: 1450 + 725 = 2175
Step 4: 2175 + 725 = 2900
Step 5: 2900 + 725 = 3625
Step 6: 3625 + 725 = 4350
Step 7: 4350 + 725 = 5075
Step 8: 5075 + 725 = 5800
Step 9: 5800 + 725 = 6525
Step 10: 6525 + 725 = 7250
Step 11: 7250 + 725 = 7975
Step 12: 7975 + 725 = 8700
Step 13: 8700 + 725 = 9425
Step 14: 9425 + 725 = 10150
Step 15: 10150 + 725 = 10875
Step 16: 10875 + 725 = 11600
Step 17: 11600 + 725 = 12325
Step 18: 12325 + 725 = 13050
Step 19: 13050 + 725 = 13775
Step 20: 13775 + 725 = 14500
Step 21: 14500 + 725 = 15225
Step 22: 15225 + 725 = 15950
Step 23: 15950 + 725 = 16675
Step 24: 16675 + 725 = 17400

So, 725*24 = 17400