This math topic focuses on the division of whole numbers by decimal tenths, an introductory concept under decimal division. The problems primarily involve dividing a given whole number by a decimal that is a tenth, such as 0.2 or 0.5, and determining the resulting value. Each problem presents an example division with a whole number for contextual help (e.g., 15 divided by 5) and then a parallel division problem using a decimal tenth (e.g., 15 divided by 0.5), with multiple choice answers ranging from small decimals to large numbers. This helps learners understand how dividing by a decimal can significantly impact the result compared to dividing by a whole number.