This math topic focuses on calculating percentages, specifically multiples of 10%. It involves real-world application questions which require finding 10% or 20% tips as per the scenarios presented in the form of picture-based questions. The problems range from identifying 10% tips out of various totals to 20% tips on different amounts. This forms part of an introductory unit on percentages, aiming to develop foundational skills in working with percentage calculations in practical contexts.