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"Four Mixed Operations of Fractions" PPT courseware 2
teaching objectives:
1. Enable students to combine the process of solving practical problems, understand and master the order of operations of the four mixed operations of fractions, and be able to perform calculations correctly according to the order of operations. Actively understand that the laws of integer operations are also applicable to fraction operations, and be able to use the laws of operations and operations according to Properties Perform some simple calculations with fractions.
2. To enable students to further develop their abilities of observation, comparison, analysis and abstract generalization in the process of understanding the order of operations of the four mixed operations of fractions and applying the laws of operations to perform simple calculations of fractions.
3. In the process of learning the four mixed operations of fractions, students can further accumulate mathematical learning experience and experience the rigor of mathematical learning and the certainty of mathematical conclusions.
Teaching focus: the order of operations of the four mixed arithmetic operations of fractions and the application of operational laws
Teaching difficulty: Use the four mixed operations of fractions to solve practical problems.
The order of the four mixed operations on integers:
1. Operations at the same level are calculated sequentially from left to right.
2. Contains two levels of operations, first multiplication and division and then addition and subtraction.
3. If there are parentheses, calculate inside the parentheses first and then outside the parentheses.
Four mixed operations on fractions
A calculation involving fractions contains two or more operations, which are collectively referred to as the four mixed operations of fractions.
The order of operation of the four mixed operations of fractions is the same as that of the four mixed operations of integers. Multiplication and division are calculated first, followed by addition and subtraction. If there are parentheses, the operations inside the parentheses must be calculated first.
summary:
What did you learn in this lesson? What are your gains and experiences?
What should you pay attention to when performing mixed operations on the four fractional arithmetic?
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