Q: What is 81 minus 63? A: 
Q: What is 77 minus 10? A: 
Q: What is 84 minus 63? A: 
Q: What is 81 minus 60? A: 
Q: What is 81 minus 63? A: 
Q: What is 81 minus 13? A: 
Q: What is 88 minus 60? A: 
Q: What is 81 minus 63? A: 