"Subtracting Two-Digit Numbers from Two-Digit Numbers" PPT teaching courseware for addition and subtraction within ten thousand

Description

"Subtracting Two-Digit Numbers from Two-Digit Numbers" PPT teaching courseware for addition and subtraction within ten thousand

Part One: Learning Objectives

1. Master the calculation method of subtracting two-digit numbers from two-digit numbers orally, and be able to perform oral calculations correctly.

2. Be able to discover mathematical problems from life, organize and analyze data, and solve practical problems.

3. Develop problem-solving abilities and improve thinking flexibility.

Learn important and difficult points

Focus: Correctly perform oral arithmetic on two-digit subtraction.

Difficulty Ability to choose appropriate methods to solve problems based on specific circumstances.

Two-digit minus two-digit PPT, part 2: review

Oral calculation.

43-7= 32-5= 65-20= 43-10=

To subtract a one-digit number from a two-digit number, you can first subtract the numbers in the ones place and then add the whole tens. If the ones digit of the minuend is not enough to reduce, it must step back from the tens digit and then subtract.

To subtract an integer from a two-digit number, you can first subtract the number in the tens place and then add the number in the ones place.

Two-digit subtraction of two-digit PPT, part three: interpretation of examples

(1) How much more expensive is the fare of an ordinary express train than that of a high-speed train?

(2) How much cheaper is the fare of the Expo special bus than that of ordinary express buses?

(1) Method 1: 65 - 54 =____

Method 2: 65 - 54 =____

(2) Method 1: 65 - 48 =____

Method 2: 65 - 48 =____

Two-digit subtraction two-digit PPT, part 4: summary

Oral arithmetic for subtracting two-digit numbers from two-digit numbers

(1) Both calculations are two-digit numbers minus two-digit numbers.

(2) The first formula does not abdicate, and the single digit is directly subtracted from the ones digit, and the tens digit is subtracted from the tens digit during calculation; the second formula abdicates, and cannot be directly subtracted during calculation.

Two digits minus two digits PPT, Part 5: Quiz in class

1. Write the number directly.

76-56= 79-28=

24+73= 65-27=

31+53= 87-38=

Two-digit subtraction of two-digit PPT, Part 6: Homework

1. Select from the after-class exercises;

2. Complete the exercises in this lesson in the exercise book.

Keywords: Free download of PPT courseware for third-grade mathematics from the People's Education Press, subtraction of two-digit numbers by two-digit PPT, download of addition and subtraction within ten thousand PPT, .PPT format;

For more information about the PPT courseware "Addition and Subtraction of Two-Digits and Subtraction of Two-Digits Within Ten Thousands", please click the Addition and Subtraction of Two-Digits and Subtraction of Two-Digits Within Tens of Thousands PPT tag.

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Update Time: 2024-10-03

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

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