"Multiplication, Addition, Multiplication and Subtraction" PPT teaching courseware for multiplication in tables

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"Multiplication, Addition, Multiplication and Subtraction" PPT teaching courseware for multiplication in tables

Part One: Introduction to the topic

On weekends, the children went to the amusement park to play together. A picture of children riding a merry-go-round. What did you all see?

(1) There are three carousels with 3 people on them, and one carousel with only 2 people on them.

(2)How many people can be found in total?

Multiplication, addition, multiplication and subtraction PPT, part 2 content: new teaching knowledge

1. Independent exploration, cooperation and exchange.

3+3+3+2=11 (people) all added up.

3x3+2=11 (people). Count the number of people on the full wooden horse first and then add the remaining people.

3x4-1=11 (people) first consider if Chengdu is full, then subtract the number of people who are not full

I found that both calculations need to be performed in two steps, first calculating the multiplication, and then calculating the addition and subtraction.

2. Practice experience and practical application.

When the animals in the forest had a party, the little monkey brought some gifts. Please look at the picture carefully: How many peaches are used in total?

3. Application improvement

Multiplication, addition, multiplication and subtraction PPT, the third part: knowledge sorting

Knowledge point 1: When adding the same numbers, you can directly rewrite it as a multiplication formula. There are questions about adding the same numbers and adding different numbers that can be expressed by the formulas of multiplication and addition or multiplication and subtraction. When calculating multiplication, addition, multiplication and subtraction, do the multiplication first and then the addition or subtraction.

【Example】How many fish are there in total?

4 × 3 + 3 = 15 (bars)

4 × 4 – 1 = 15 (bars)

Summary: When answering, you must first look at the picture to understand the meaning of the question. You can use multiplication for several parts of the number, and add or subtract the rest using the calculations of multiplication, addition or multiplication and subtraction.

Knowledge point 2: Two adjacent multiplication sentences can be expressed by multiplication and addition or multiplication and subtraction formulas.

【Example】5×4-5=( )×( )

Analysis: 5×4 means the addition of four 5s. 5×4-5 can be understood as subtracting one 5 from the sum of four 5s and leaving three 5s. The multiplication expression is 3×5.

Summary: When solving problems, you must first understand the meaning of multiplication formulas and flexibly convert between multiplication formulas and addition and subtraction formulas.

Multiplication, addition, multiplication and subtraction PPT, Part 4: Classroom exercises

1. Look at the diagram.

2. Look at the pictures and list the different calculation formulas.

3. Oral arithmetic competition.

5×3+2= 4×3-1= 2×4+2=

3×5- 1= 3×2+2= 2×4+4=

4×4+4= 3×3 -1= 3×4 -1=

Multiplication, addition, multiplication and subtraction PPT, Part 5: Homework

1. Oral calculation.

3 × 4 + 4 = 3 × 2 - 3 =

4×4 - 4 = 5×3 + 2 =

5×5 - 5 = 1×5 + 2 =

2×5 - 5 = 4×2 + 2 =

2. Change the following equation into one containing multiplication.

(1) 3＋3＋3 =_________ 4+4+4 =_________.

(3) 5＋5＋5+3=___________ 2+3+3=___________.

(5) 2＋2＋2+3=_________ 1+6＋6+6=________.

3. To ask how many rackets there are in total, you can use ( ) × ( ) + ( ) = ( ) or ( ) × ( ) – ( ​​) = ( ).

Multiplication, addition, multiplication and subtraction PPT, part 6: expansion and improvement

1. Solve the problem.

(1) How many test tubes are there in total?

3 x 5 + 4 = 19 (counts) or 4 x 5 – 1 = 19 (counts)

Answer There are 19 test tubes in total.

2. Solve the problem

(1) How much does it cost to buy 2 pencil cases and a pen?

2 x 4 + 5 = 13 (yuan) Answer: A total of 13 yuan is needed.

(2) What questions can you ask?

The answer is not unique, just fits the question.

divergent thinking

1. Complete the blanks below.

Positive Positive ( ) × ( ) = ( )

Positive Positive ( ) × ( ) + ( ) = ( )

Positive Positive Positive ( ) × ( ) + ( ) = ( )

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For more information about the PPT courseware "Multiplication in Tables, Multiplication, Addition, Multiplication and Subtraction", please click the Multiplication in Tables PPT Multiplication, Addition, Multiplication and Subtraction PPT tab.

"Multiplication, Addition, Multiplication and Subtraction" PPT download of multiplication in the table:

"Multiplication, Addition, Multiplication and Subtraction" Multiplication in the Table PPT Download Part One: Review Introduction 3 5 =15 What does multiplication and addition mean? What does multiplication and subtraction mean? What is the order of operations? ... ... ... Multiplication, addition, multiplication and subtraction PPT, part 2 content: independent exploration What you get from this picture...

"Multiplication, Addition, Multiplication and Subtraction" Multiplication PPT in the table:

"Multiplication, Addition, Multiplication and Subtraction" Multiplication in Tables PPT Part One: Learning Objectives 1. Preliminarily understand the meaning of comprehensive calculations, and master the order of mixed operations involving multiplication, addition and subtraction. 2. Through appropriate exercises, timely consolidate the newly learned sequence of operations and parallel comprehensive calculations to solve a...

"Multiplication, addition, multiplication and subtraction" PPT courseware for multiplication in tables 5:

"Multiplication, Addition, Multiplication and Subtraction" PPT Courseware for Multiplication in Tables 5 Recall the multiplication formulas 11 ( ) 25 ( ) 34 ( ) 45 ( ) 24 ( ) 35 ( ) Test your oral calculation 34= 4＋4= 13- 9= 7+8= 54= 12-2= 3+5+4= 6+8-5= ... ...

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Update Time: 2024-09-26

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

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