"Subtraction" PPT on addition and subtraction within ten thousand (Lesson 2)

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"Subtraction" PPT on addition and subtraction within ten thousand (Lesson 2)

Part One: Review Import

Calculate the following questions in vertical form.

463-158 321-78 728-445

Subtraction PPT, part 2: exploration of new knowledge

Knowledge point 1: Continuous subtraction of three-digit numbers with 0 in the middle of the minuend

In 2004, it is planned to produce 158 domestic TV cartoons, and in 2005, it is planned to produce 403 domestic TV cartoons. How many more cartoons are planned to be produced in 2005 than in 2004?

How to list the formula? What is the estimated result?

403－158=

Let's swing it together with a stick.

First lay out 4 hundreds and 3 ones.

Subtracting 8 from 3 in the units digit is not enough. If the tens digit is reduced by 1, if the tens digit is 0, then the hundreds digit must be reduced by 1 to make 10.

Then step back 1 from the 10 that was dropped to the ones place to make 10. At this time, the tens place is 9.

13-8 in the single position.

Subtraction PPT, Part 3: Corresponding exercises

Think, dial, and do the math.

500-268 420-56 306-197

1000-520=480

Subtraction PPT, part 4: knowledge summary

Continuous subtraction with 0 in the middle or at the end of the minuend:

To subtract a three-digit number from a three-digit number, when the units digit is not subtracted enough and the tens place is 0, step back 1 from the hundreds place and make it 10, put it in the tens place, then step back 1 from the tens place and make it 10 and put it in the ones place. At this time, there are 9 10s left in the tens place.

How to check subtraction:

①Add and subtract numbers using differences to see if they are equal to the minuends

② Subtract the difference from the minuend to see if it is equal to the subtrahend.

Subtraction PPT, Part 5: Consolidation Practice

Decide whether the following questions are correct or not, and correct them if they are incorrect.

It turns out there is 1 ton of pumpkins. I transported 567 kilograms. How many kilograms are left?

1 ton = 1000 kilograms

1000-564=436 (kg)

Answer: There are 436 kilograms left.

The grocery store shipped 400 kilograms of eggs and sold 152 kilograms in the morning. How many kilograms are left?

400-152=248 (kg)

Answer: There are 248 kilograms left.

Subtraction 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, download of subtraction PPT, download of addition and subtraction within ten thousand PPT, .PPT format;

For more information about the PPT courseware "Addition and Subtraction Within Ten Thousand", please click the Subtraction PPT Addition and Subtraction Within Ten Thousand PPT tab.

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Update Time: 2024-11-22

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

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