Q: What is 91 minus 49? A: 
Q: What is 87 minus 58? A: 
Q: What is 99 minus 49? A: 
Q: What is 91 minus 40? A: 
Q: What is 81 minus 49? A: 
Q: What is 91 minus 89? A: 
Q: What is 92 minus 40? A: 
Q: What is 91 minus 49? A: 