"Add and Subtract Hundreds and Tens" PPT on Addition and Subtraction within Ten Thousands

Description

"Add and Subtract Hundreds and Tens" PPT on Addition and Subtraction within Ten Thousands

Part I: Learning Objectives

1. Learn to add and subtract hundreds and tens to hundreds and tens, be able to perform calculations correctly, and master written calculation methods; experience the application of estimation in daily life, enhance the awareness and ability of estimation, and be able to estimate based on specific situations.

2. Cultivate students' computing abilities, allowing students to further experience the close connection between mathematics and life in the process of solving simple practical problems, and enhance their awareness of applied mathematics.

[Learning Key Points]

Correctly calculate hundreds and tens, add and subtract hundreds and tens; master the estimation methods of addition and subtraction.

[Difficulties in learning]

Master the oral and written calculation algorithms for adding and subtracting hundreds and tens of hundreds and tens; cultivate students' estimation awareness and problem-solving abilities.

PPT of adding and subtracting hundreds and tens to hundreds and tens, the second part: reviewing the past and learning the new

(1)280 contains ( ) tens. 36 tens are ( ).

(2) Oral calculation.

85-23= 19+44=

76+21= 63-34=

56+44= 92-34=

think about it

(1) How much does it cost to buy a bicycle and an electric car?

(2) How much less does it cost to buy a bicycle than to buy an electric car?

Adding and subtracting hundreds and tens to hundreds and tens PPT, the third part: classroom practice

1. Fill in the blanks.

(1) Which digit adds up to ten, move ( ) to the ( ) digit; which digit is not enough to subtract, move backward ( ) from the ( ) digit, and then subtract by ( ).

(2) Write the following approximate numbers.

702() 501() 298() 691() 325()

【Answer】

(1) Previous, 1; Previous, 1

(2) 700; 500; 300; 700; 300

【Analysis】

(1) Fill in the blanks according to the algorithm;

(2) This question tests the knowledge of "using estimation to solve problems". For approximate numbers, you must understand the concept of "rounding".

2. Select .

(1) A phone is 105 yuan, a fan is 65 yuan, and an electronic watch is 25 yuan. Is 200 yuan enough to buy it? ( )

A. Not enough B. Not more, not less, just enough C. Enough to buy, and there is still money left

(2) This VCD is now ( ) cheaper than its original price.

A. 131 yuan B. 149 yuan C. 49 yuan

3. Vertical calculation.

375+168= 709-425=

376+589= 603-497=

Hundreds and tens plus and minus hundreds and tens PPT, the fourth part: summary

Estimating three-digit addition and subtraction of three-digit numbers

Treat each three-digit number as the nearest whole hundred number before calculating.

Think of each three-digit number as a number that is close to it and then calculate it.

Adding and subtracting hundreds and tens to hundreds and tens PPT, part five: after-class consolidation

1. Book borrowing registration form. (Unit: Ben)

【Analysis】

The total number - the number of books borrowed = the remaining books, thus changing the relationship.

2. Column calculation.

(1) How much less is 244 than 700?

(2) What number is 95 more than 306?

(3) The minuend is 321 and the subtrahend is 79. What is the difference?

【Answer】

(1)700-244=456

(2)306+95=401

(3)321-79=242

【Analysis】

To find out how much less one number is than another number, use the larger number to reduce the number, and then transform the method accordingly.

3. The fruit shop brought in 318 kilograms of lychees and sold 276 kilograms in the morning. How many kilograms are left?

【Answer】

318-276=42 (kg)

Answer: There are 42 kilograms left.

【Analysis】

According to the meaning of the question, the remaining fruits should be 318 kilograms of lychees transported by the fruit store minus those sold in the morning: 318-276 = 42 (kilograms). Pay attention to the units and the answer.

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For more information about the PPT courseware "Addition and Subtraction within Ten Thousands, Adding and Subtracting Hundreds and Tens, Adding and Subtracting Hundreds and Tens", please click the Addition and Subtracting Within Ten Thousand PPT, Adding and Subtracting Hundreds and Tens PPT tag.

"Add and Subtract Hundreds and Tens to Hundreds and Tens" PPT teaching courseware for addition and subtraction within ten thousand:

"Addition and subtraction of hundreds and tens" PPT teaching courseware for addition and subtraction within ten thousand Part 1 Content: Learning objectives 1. Learn to add and subtract hundreds and tens, be able to calculate correctly, and master the method of pen and paper calculation. 2. Cultivate the awareness and ability to transfer old knowledge to solve new problems..

"Add and Subtract Hundreds and Tens from Hundreds and Tens" PPT download of addition and subtraction within ten thousand:

"Add and Subtract Hundreds and Tens to Hundreds and Tens" Addition and Subtraction within Ten Thousands PPT Download Part 1: Review old knowledge and see who can calculate quickly and correctly. 54+26= 36+26= 46+39= 42-21= 34-27= 46-18= ... ... ... hundreds and tens plus and minus hundreds and tens PPT, Chapter...

"Adding and Subtracting Hundreds and Tens from Hundreds and Tens" PPT courseware for addition and subtraction within ten thousand:

"Add and Subtract Hundreds and Tens" PPT Courseware on Addition and Subtraction within Ten Thousand Part One Content: Learning Objectives 1. Learn to add and subtract hundreds and tens, be able to calculate correctly, and master how to hold a pen method. 2. Cultivate the awareness and willingness to choose the best among different methods..

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Update Time: 2024-12-03

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

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