"The Growth of Tadpoles" Addition and Subtraction PPT (Lesson 2)

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"The Growth of Tadpoles" Addition and Subtraction PPT (Lesson 2)

Part One: Learning Objectives

1. Master the arithmetic and vertical calculation method of continuous abdication subtraction when the minuend is an integer. (emphasis)

2. Improve computing power. (difficulty)

Column vertical calculation.

634-177= 372-299=

The growth of tadpoles PPT, part two: exploring new knowledge

Knowledge points: Calculation method of subtraction with 0 at the end of the minuend

I bought 300 balloons for a party, and 76 of them were blown up. How many were left that were not blown up?

300-70＝230

230-6＝224

The tens digit is 0 and cannot be borrowed. First, the tens digit borrows 1 from the hundreds digit to become a ten, and then the ones digit borrows 1 from the tens digit.

Answer: There are still 224 that have not been blown well.

Xiaoxiao calculates it like this, can you understand it? Talk to your companions.

Xiaoxiao transforms the continuous abdication subtraction into a non-abdication subtraction.

Knowledge refining

When calculating the subtraction with 0 at the end of the minuend, borrow 1 from the front, the 0 in the ones digit is regarded as 10, and the 0 in the remaining digits is regarded as 9.

The growth of tadpoles PPT, the third part: consolidation practice

1. Fill it out.

2. How much yuan should be recovered?

200-178＝22 (yuan)

Answer: You should get 22 yuan back.

3.800-425＝375

800-297＝503

425-297＝128

4. (1) Estimate, are the seats in the theater enough?

203＜210 278＜280

203+278＜490＜500 (pieces)

(2) Count, how many students went to watch the movie?

203+278=481 (name)

Answer: A total of 481 students went to see the movie.

The growth of tadpoles PPT, part 4: Class summary

What knowledge have you learned in this class?

When calculating the subtraction with 0 at the end of the minuend, borrow 1 from the front, the 0 in the ones digit is regarded as 10, and the 0 in the remaining digits is regarded as 9.

The growth of tadpoles PPT, part 5: homework

Assignment 1: Complete the exercises related to the textbook.

Assignment 2: Complete the corresponding exercises.

Keywords: Beijing Normal University edition second grade mathematics PPT courseware for the second volume free download, growth of tadpoles PPT download, addition and subtraction PPT download, .PPT format;

For more information about the PPT courseware "Adding and Subtracting the Growth of Tadpoles", please click the Adding and Subtracting PPT Tadpoles' Growth PPT tab.

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Update Time: 2024-11-25

This template belongs to Mathematics courseware Beijing Normal University Edition Second Grade Mathematics Volume 2 industry PPT template

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