The different methods of business valuation include asset-based valuation, market-based valuation, income-based valuation, and discounted cash flow valuation. Asset-based valuation is based on the value of the business's assets, market-based valuation is based on the market value of the business's shares, income-based valuation is based on the business's expected future earnings, and discounted cash flow valuation is based on the present value of the business's future cash flows.