Katie was at Target, Katie had 20 dollars, and she bought a new water bottle that cost 12 dollars. Also, Katie bought a new volleyball that cost 10 dollars. When she got to the register, the man said, "That will be 22 dollars." She didn't have enough money because 20-(-22)=-2.
Nadia went to the beach and she wanted 10 seashells. Olivia decided to help her. Olivia found 15 and Nadia found 1. The integer problem would be -10+(15+1)=6.
Emily wanted a new phone case that cost 17 dollars, but Emily didn't have any money. Emily had to earn 17 dollars until she could get the phone case. The integer problem would be 17-(-17)=0.