Q: What is 80 minus 39? A: 
Q: What is 79 minus 38? A: 
Q: What is 89 minus 39? A: 
Q: What is 80 minus 30? A: 
Q: What is 80 minus 39? A: 
Q: What is 80 minus 79? A: 
Q: What is 87 minus 36? A: 
Q: What is 80 minus 39? A: 