This investigation is concerned with the use of quantitative business models as an aid for financial management by entrepreneurs to surmount Nigeria`s economic challenges. The investigation used causal comparative or ex-post-facto research design. This research design seeks to find out that which is associated with certain occurrence, conditions, and outcomes types of behavior by analysis of the past events, or already existing records. The name export-facto is based on the fact that the data used for this study were already in existence. It is worthy to know that some of the data were formulated/ modernized by the researchers to suit the reasons for the finding. It was discovered that quantitative business models like price earnings ratio, dividend-discount-model, discount-cash-flow-model, Pie in 3-D, price-to cash-flow-ratio, cost-benefit-analysis, breaking-even-analysis, statistics analysis of feasibility study, gross-domestic-product (GDP), and  contribution margin (marginal income) etc.,  were used as an aid for financial management in the areas of investments decision-making to clients, financial projection of potential future performance of firms, determining stock valuation of companies in the same industries, to know sales rate/investment areas and expected returns of private and public firms. The necessities of a combination of qua imitative and qualitative as well as strategic alliance among professionals of the tools users for better result were also given maximum attention in this study. Among other things it was recommended that firms and entrepreneurs should use quantitative models as aids or tools for financial management to achieve success