"Mixed Operations of Addition and Subtraction of Fractions" PPT teaching courseware for addition and subtraction of fractions

Description

"Mixed Operations of Addition and Subtraction of Fractions" PPT teaching courseware for addition and subtraction of fractions

Part One: Learning Objectives

1. Master the order of operations and calculation methods of mixed operations of addition and subtraction of fractions, as well as the order of operations and algorithms of mixed operations of addition and subtraction of fractions with parentheses. (emphasis)

2. Understand that the mixed operations of addition and subtraction of fractions can also be calculated once and again, and can use the mixed operations of addition and subtraction of fractions to solve some simple practical problems. (difficulty)

PPT on mixed operations of addition and subtraction of fractions, part 2: exploring new knowledge

Knowledge point 1 The order of operations and calculation method of mixed operations of addition and subtraction of fractions without parentheses

(1) What percentage of the park area does the forest part account for compared to the grassland part?

Think about it: 1. How to calculate?

2. Can you use the knowledge you have learned to solve it?

Think: What is the difference between these two methods? Which one is easier? What should we pay attention to?

The first method: pass the points step by step, and the second method: pass the points all at once. The first method is simple. The calculation result can be reduced to the simplest fraction.

Knowledge refining

1. The order of operations for mixed operations of addition and subtraction of fractions is the same as that of mixed operations of addition and subtraction of integers. If there are no parentheses, calculations are performed from left to right.

2. The mixed operation of calculating fractions with different denominators without parentheses can be calculated step by step, or several fractions can be calculated at once.

Knowledge point 2 The order of operations and calculation method of mixed operations of addition and subtraction of fractions with parentheses

(2) Comparison of precipitation conversion conditions in forests and bare ground

What fraction of precipitation does groundwater stored on bare ground account for?

What is the order of operations for mixed operations of addition and subtraction of fractions?

The order of operations for the mixed operations of addition and subtraction of fractions is the same as that of the mixed operations of addition and subtraction of integers. They are calculated from left to right. If there are parentheses, the inside of the parentheses must be calculated first.

Knowledge refining

The order of operations for mixed operations of addition and subtraction of fractions is the same as that of mixed operations of addition and subtraction of integers. If there are parentheses, the operations inside the parentheses must be calculated first, and then the operations outside the parentheses.

PPT on mixed operations of addition and subtraction of fractions, part 3: consolidation exercises

1. Calculate. (Selected from textbook P100 T1)

2. Li Ming used a 1m long wire to surround a triangle. One side of the triangle was measured to be 1/4m and the other side was 3/8m. How many meters is the third side? What kind of triangle is it? (Selected from textbook P100 T2)

3. Class 5 (1) students went to visit the old revolutionary areas and spent 10 hours in total. Among them, the time spent on the road accounts for 1/5, the time for lunch and rest account for 3/10, and the rest is the time for sightseeing. What percentage of the time is for sightseeing? (Selected from textbook P100 T3)

PPT on mixed operations of addition and subtraction of fractions, part 4 content: Class summary

What knowledge have you learned in this class?

The order of operations for mixed operations of addition and subtraction of fractions is the same as that of mixed operations of addition and subtraction of integers. If there are parentheses, the operations inside the parentheses must be calculated first, and then the operations outside the parentheses.

PPT on mixed operations of addition and subtraction of fractions, Part 5: Classwork

Assignment 1: Complete the exercises related to the textbook.

Assignment 2: Complete the corresponding exercises.

Keywords: Free download of PPT courseware for mathematics in the second volume of the fifth grade of the People's Education Press, PPT download of mixed operations of addition and subtraction of fractions, PPT download of addition and subtraction of fractions, .PPT format;

For more information about the PPT courseware "Addition and Subtraction of Fractions and Mixed Operations of Fractional Addition and Subtraction", please click the Addition and Subtraction of Fractions PPT Mixed Operations of Fractions Addition and Subtraction PPT tag.

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Update Time: 2024-07-01

This template belongs to Mathematics courseware People's Education Press Fifth Grade Mathematics Volume 2 industry PPT template

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