"Addition with Carry" PPT teaching courseware for addition and subtraction within 100

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"Addition with Carry" PPT teaching courseware for addition and subtraction within 100

Part One: Introduction to the topic

1. Calculate orally and talk about your algorithm.

5+34= 63+7= 9+84= 38+50=

2. Calculate using the firm formula.

32+6= 5+43= 24+61= 32+37=

Carry plus PPT, the second part of the content: new teaching knowledge

1. Create situations and introduce passion.

What math questions can you ask based on the information in the picture?

How many students are there in Class 2(1) and Class 2(3)?

List the calculation formula: 35+37=.

2. Operate and explore, learn new knowledge.

What method do you want to use to calculate the number? Give it a try by working in a group!

(1) Use a small stick to swing.

(2) Column vertical calculation.

Add 5 to 7 in the ones place to get 12, advance 1 to the tens place, and write 2 in the ones place.

Class summary: When doing addition by hand, you should align the same digits, add from the ones digit, and when the ones digit reaches ten, add "1" to the tens digit.

Carry plus PPT, the third part: knowledge sorting

Knowledge point: When calculating two digits plus two digits (carry), the same digits must be aligned when calculating in column and vertical format. Starting from the ones digit, add one to the tens digit when the ones digit reaches ten.

[Example] Vertical calculation: 54+38=

Summary: When writing vertical forms, the digits must be aligned, starting from the ones digit. Add 4 to 8 in the ones place to get 12, write 2 in the ones place, add 1 to the tens place, add 3 to the 5 in the tens place, add the 1 that came in in the ones place, and get 9.

Carry plus PPT, Part 4: Classroom Exercises

1. Happy answering.

(1) When calculating two-digit addition, you should add from the ( ) position.

(2) When calculating the addition of two-digit numbers, the same digits must be ( ).

(3) When calculating the addition of two-digit numbers, the ones digit is added to ( ), and 1 is carried to the ( ) digit. The tens digit is added to ( ), and the phase ( ) digit is rounded to 1.

(4) When calculating 34+28, add 4 to 8 in the units digit to get ( ), carry 1 to the ( ) digit, and write ( ) in the units digit.

2. Ask the children to guess which tens place should be filled in the sum.

3. Vertical calculation.

4. Solve the problem.

(1) Xiao Wei kicked the shuttlecock 17 times the first time and 26 times the second time. How many times were there in total?

17+26=43 (pieces)

(2) There are 56 kilograms of apples and 38 kilograms of peaches in the fruit store. How many kilograms are there in total for the two fruits?

56+38=94 (kg)

(3) Mom spent 28 yuan on a skirt for Xiaohong and 65 yuan on a top. How much did mom spend in total?

28+65=93 (yuan)

Carry plus PPT, Part 5: Homework

1. I can speak.

When adding two-digit numbers to two-digit numbers, you should pay attention to the following:

(1) Add two digits to two digits, pair the ones digit ( ), pair the tens digit ( ), and use the same digit ( ).

(2) To add two digits to two digits, start from the ( ) digit.

(3) When the numbers in the ones digit add up to ( ), advance 1 to ( ).

2. Vertical calculation.

25+38= 67+16= 9+37= 29+48=

30+17= 87+6= 13+77= 5+34=

3. Fill in ">", "<" or "=" in the ○ below.

1m+35cm○125cm 52+19○52 64+8○26

4m○40cm 35+34○34+25 37+38○48+29

6m-3m○200cm 56+9○46+19 41+19○52

81cm-20cm○70cm 23+69○90 28+72○100

Carry plus PPT, part six: knowledge expansion

1. I will solve the problem.

(1) Xiao Hong and Xiao Ming went fishing. Xiao Hong caught 17 fish and Xiao Ming caught 24 fish. How many fish did Xiao Ming and Xiao Hong catch in total?

17+24=41 (bar)

Answer: Xiao Ming and Xiao Hong caught 41 fish in total.

(2) Uncle Li sold 34 baskets of fruits this week, and there are still 28 baskets left. How many baskets of fruit did Uncle Li have?

34+28=62 (basket)

Answer: Uncle Li originally had 62 baskets of fruit.

2. Solve the problem.

A toy airplane costs 29 yuan, an umbrella costs 16 yuan, and a toy car costs 30 yuan.

①How much does it cost to buy 1 umbrella and 1 toy car?

②How much does it cost to buy 1 umbrella and 1 toy airplane?

16+30=46 (yuan)

29+16=45 (yuan)

Answer: You need to pay 46 yuan to buy 1 umbrella and 1 toy car, and 45 yuan to buy 1 umbrella and 1 toy airplane.

Keywords: Free download of PPT courseware for second grade mathematics from People's Education Press, download of carry and addition PPT, download of addition and subtraction within 100 PPT, .PPT format;

For more information about the PPT courseware "Addition and Subtraction within 100, Carry and Add", please click on the Addition and Subtraction within 100 PPT Carry and Add PPT tag.

"Addition with Carry" PPT courseware download of addition and subtraction within 100:

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Update Time: 2024-09-08

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

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