This math topic focuses on introducing the basics of data interpretation and graph reading through tally charts. It involves comparing quantities to determine the difference between two sets of data. Specifically, the problems involve finding out how many more of one type of pet (like lizards, birds, cats, dogs, or fish) certain kids have compared to another type, by using visual information presented in tally charts. The ability to interpret these charts and perform simple subtraction to find the differences is essential for solving these problems.