To make the mind map of Unit 6 in Grade Three, we should first make clear the theme and important concepts of the unit. Title: Important concepts of fraction: definition and properties of fraction, multiplication and division of fraction, and application of fractional mixed operation. According to the above topics and important concepts, we can organize them into mind maps.

Definition and nature of fraction, definition: divide a whole into several parts on average, and the number representing one or several parts is called fraction. Properties: The fraction is a positive number, the numerator is greater than the denominator, and both numerator and denominator are integers. Addition and subtraction of fractions, addition and subtraction of fractions with denominator: denominator unchanged, numerator addition and subtraction. Addition and subtraction of fractions with different denominators: divide first, and then add and subtract fractions with the same denominator for calculation.

Fractional multiplication: numerator multiplied by numerator and denominator multiplied by denominator. Fractional division: the divisor is turned into a multiplier, and the dividend is turned into a divisor, which becomes the basic property of component division. The mixed operation order of fractions: first calculate the power, then calculate the multiplication and division, and finally calculate the addition and subtraction; If there are brackets, count them first.

Application of fractions and reciprocity of decimals: To convert decimals into percentages or percentages into decimals, the numerator and denominator of decimals or percentages should be multiplied by appropriate multiples at the same time. For example, convert 0.54 into percentage (54%) or decimal 0.54 (that is, 54/ 100 or 54%); Convert the percentage from 36% to 0.36 (i.e. 36/ 100 or 36%).

Reciprocity of percentage and score: Percent the number of components, first rewrite the percentage into the number of components, and the quotation that can be reduced becomes the simplest score; When a fraction is rewritten as a percentage, it is generally to first convert the fraction into a decimal (except for inexhaustible), and then convert the decimal into a percentage.

Comparison size: numerator is the same as denominator, and the bigger the denominator, the smaller the score; Comparing molecules with the same denominator, the bigger the molecule, the greater the score. Find the least common multiple: the least common multiple of two numbers is their least common multiple. Approximate fraction: Turn a fraction into the simplest fraction. Percent: Percent is a number, indicating that one number is a percentage of another. It only represents the ratio of a number to 100, and there is no unit name of fraction.

Summarize and review what you have learned in this unit, and master the concept, nature, operation and application of fractions. Deepen the understanding and mastery of scores through exercises and examples. Encourage students to apply fractional knowledge to solve practical problems in daily life.