Q: What is 13 minus 12? A: 
Q: What is 54 minus 36? A: 
Q: What is 19 minus 12? A: 
Q: What is 13 minus 10? A: 
Q: What is 83 minus 12? A: 
Q: What is 13 minus 12? A: 
Q: What is 20 minus 19? A: 
Q: What is 13 minus 12? A: 