Q: What is 71 minus 21? A: 
Q: What is 64 minus 28? A: 
Q: What is 76 minus 21? A: 
Q: What is 71 minus 20? A: 
Q: What is 81 minus 21? A: 
Q: What is 71 minus 51? A: 
Q: What is 71 minus 22? A: 
Q: What is 71 minus 21? A: 