Sure thing! We've got 50 and we're gonna multiply it by 9. That's the same as adding 50 to itself 9 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

So, 50*9 = 450