Q: How much is 29 minus 28? A: 
Q: How much is 80 minus 60? A: 
Q: How much is 29 minus 28? A: 
Q: How much is 29 minus 25? A: 
Q: How much is 79 minus 28? A: 
Q: How much is 29 minus 18? A: 
Q: How much is 30 minus 29? A: 
Q: How much is 29 minus 28? A: 