Sure thing! We've got 500 and we're gonna multiply it by 40. That's the same as adding 500 to itself 40 times.
Step 1: 0 + 500 = 500
Step 2: 500 + 500 = 1000
Step 3: 1000 + 500 = 1500
Step 4: 1500 + 500 = 2000
Step 5: 2000 + 500 = 2500
Step 6: 2500 + 500 = 3000
Step 7: 3000 + 500 = 3500
Step 8: 3500 + 500 = 4000
Step 9: 4000 + 500 = 4500
Step 10: 4500 + 500 = 5000
Step 11: 5000 + 500 = 5500
Step 12: 5500 + 500 = 6000
Step 13: 6000 + 500 = 6500
Step 14: 6500 + 500 = 7000
Step 15: 7000 + 500 = 7500
Step 16: 7500 + 500 = 8000
Step 17: 8000 + 500 = 8500
Step 18: 8500 + 500 = 9000
Step 19: 9000 + 500 = 9500
Step 20: 9500 + 500 = 10000
Step 21: 10000 + 500 = 10500
Step 22: 10500 + 500 = 11000
Step 23: 11000 + 500 = 11500
Step 24: 11500 + 500 = 12000
Step 25: 12000 + 500 = 12500
Step 26: 12500 + 500 = 13000
Step 27: 13000 + 500 = 13500
Step 28: 13500 + 500 = 14000
Step 29: 14000 + 500 = 14500
Step 30: 14500 + 500 = 15000
Step 31: 15000 + 500 = 15500
Step 32: 15500 + 500 = 16000
Step 33: 16000 + 500 = 16500
Step 34: 16500 + 500 = 17000
Step 35: 17000 + 500 = 17500
Step 36: 17500 + 500 = 18000
Step 37: 18000 + 500 = 18500
Step 38: 18500 + 500 = 19000
Step 39: 19000 + 500 = 19500
Step 40: 19500 + 500 = 20000

So, 500*40 = 20000