Sure thing! We've got 0 and we're gonna multiply it by 45. That's the same as adding 0 to itself 45 times.
Step 1: 0 + 0 = 0
Step 2: 0 + 0 = 0
Step 3: 0 + 0 = 0
Step 4: 0 + 0 = 0
Step 5: 0 + 0 = 0
Step 6: 0 + 0 = 0
Step 7: 0 + 0 = 0
Step 8: 0 + 0 = 0
Step 9: 0 + 0 = 0
Step 10: 0 + 0 = 0
Step 11: 0 + 0 = 0
Step 12: 0 + 0 = 0
Step 13: 0 + 0 = 0
Step 14: 0 + 0 = 0
Step 15: 0 + 0 = 0
Step 16: 0 + 0 = 0
Step 17: 0 + 0 = 0
Step 18: 0 + 0 = 0
Step 19: 0 + 0 = 0
Step 20: 0 + 0 = 0
Step 21: 0 + 0 = 0
Step 22: 0 + 0 = 0
Step 23: 0 + 0 = 0
Step 24: 0 + 0 = 0
Step 25: 0 + 0 = 0
Step 26: 0 + 0 = 0
Step 27: 0 + 0 = 0
Step 28: 0 + 0 = 0
Step 29: 0 + 0 = 0
Step 30: 0 + 0 = 0
Step 31: 0 + 0 = 0
Step 32: 0 + 0 = 0
Step 33: 0 + 0 = 0
Step 34: 0 + 0 = 0
Step 35: 0 + 0 = 0
Step 36: 0 + 0 = 0
Step 37: 0 + 0 = 0
Step 38: 0 + 0 = 0
Step 39: 0 + 0 = 0
Step 40: 0 + 0 = 0
Step 41: 0 + 0 = 0
Step 42: 0 + 0 = 0
Step 43: 0 + 0 = 0
Step 44: 0 + 0 = 0
Step 45: 0 + 0 = 0

So, 0*45 = 0