Q: What is 81 minus 81? A: 
Q: What is 62 minus 22? A: 
Q: What is 89 minus 81? A: 
Q: What is 81 minus 80? A: 
Q: What is 91 minus 81? A: 
Q: What is 81 minus 21? A: 
Q: What is 81 minus 82? A: 
Q: What is 81 minus 81? A: 