Sure thing! We've got 200 and we're gonna multiply it by 20. That's the same as adding 200 to itself 20 times.
Step 1: 0 + 200 = 200
Step 2: 200 + 200 = 400
Step 3: 400 + 200 = 600
Step 4: 600 + 200 = 800
Step 5: 800 + 200 = 1000
Step 6: 1000 + 200 = 1200
Step 7: 1200 + 200 = 1400
Step 8: 1400 + 200 = 1600
Step 9: 1600 + 200 = 1800
Step 10: 1800 + 200 = 2000
Step 11: 2000 + 200 = 2200
Step 12: 2200 + 200 = 2400
Step 13: 2400 + 200 = 2600
Step 14: 2600 + 200 = 2800
Step 15: 2800 + 200 = 3000
Step 16: 3000 + 200 = 3200
Step 17: 3200 + 200 = 3400
Step 18: 3400 + 200 = 3600
Step 19: 3600 + 200 = 3800
Step 20: 3800 + 200 = 4000

So, 200*20 = 4000