Q: How much is 51 minus 49? A: 
Q: How much is 39 minus 37? A: 
Q: How much is 59 minus 49? A: 
Q: How much is 51 minus 40? A: 
Q: How much is 61 minus 49? A: 
Q: How much is 51 minus 29? A: 
Q: How much is 52 minus 40? A: 
Q: How much is 51 minus 49? A: 