"Addition and Subtraction Mix" PPT on addition and subtraction within 100

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"Addition and Subtraction Mix" PPT on addition and subtraction within 100

Part One: Conversation Introduction

Children, tell your classmates what math-related problems you discovered while riding the bus.

Addition and subtraction mixed PPT, part 2 content: independent exploration

67-25+28

67-25+28=70 (person)

Cooperative learning

72-(47+16)

What are the similarities and differences between this question and the question we just asked?

The same thing: they are both addition and subtraction mixed

Difference: There are no parentheses in the first line, and there are parentheses in the second line.

Addition and subtraction mixed PPT, the third part: applying what you have learned

1. There were originally 30 birds on the tree, 15 flew away, and later 18 flew back. How many birds are in the tree now?

30-15+18=33 (only)

Answer: There are 33 birds in the tree now.

2. Xiaohong had 50 yuan, and spent 16 yuan on stationery and 29 yuan on books. How much money does she have left?

50-16-29=5 (yuan)

Answer: She still has 5 yuan.

Addition and subtraction mixed PPT, the fourth part: summary and improvement

For mixed operations of addition and subtraction, it is easier to write two vertical expressions into one vertical expression during the written calculation process. Those who can do the calculation orally during the calculation process must do it orally.

Job design

Question 5 of Exercise 5 on page 29 of the textbook

Keywords: Free download of second-grade mathematics PPT courseware from People's Education Edition, download of mixed addition and subtraction PPT, download of addition and subtraction PPT within 100, .PPT format;

For more information about the PPT courseware "Addition and subtraction within 100 plus mixed addition and subtraction", please click the Addition and subtraction within 100 mixed addition and subtraction PPT courseware.

"Mixed Operations of Addition and Subtraction of Rational Numbers" Rational numbers and their operations PPT (Lesson 3):

"Mixed Operations of Addition and Subtraction of Rational Numbers" Rational Numbers and Their Operations PPT (Lesson 3) Part One Content: Learning Objectives 1. Master the skills of mixed operations of addition and subtraction of rational numbers and perform skilled operations. 2. Gain problem-solving skills through reflection on the process of solving simple practical problems.

"Mixed Operations of Addition and Subtraction of Rational Numbers" Rational numbers and their operations PPT (Lesson 2):

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"Mixed Operations of Addition and Subtraction of Rational Numbers" Rational numbers and their operations PPT (Lesson 1) Part 1: Review of old knowledge 1. What are the rules of addition and subtraction of rational numbers respectively? The addition rules of rational numbers: (1) When adding two numbers with the same sign, take the same sign and put...

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Update Time: 2024-11-13

This template belongs to Mathematics courseware People's Education Press Second Grade Mathematics Volume 1 industry PPT template

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