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Authoritative PPT Summary
"Ten minus 9" Abdication subtraction within 20 PPT courseware 2
1. Comparison of old and new, summary algorithm
(1) Practice adding numbers to 9
Question: How come you can calculate it so quickly? Can you tell me what method you used to calculate it?
(2) Exercise of subtracting 9 from a dozen
Questions: 1. How can you calculate it so quickly? Can you tell me what method you used to calculate it?
2. What should we pay attention to when using the ten-breaking method?
2. Various exercises to consolidate the algorithm
(1) One picture and two equations reveal the connection between addition and subtraction
Questions: 1. If you look at this picture carefully, what do you know?
2. Can you ask a question and answer it in parallel?
3. Observe these two equations carefully. Do you find anything?
4. If we can’t subtract 9 from a dozen, what can we use to think about it?
(2) Messenger game to consolidate the algorithm
Question: Use your favorite calculation method to help the little pigeon deliver the letter to the corresponding house.
(3) Clarify calculations and solve problems
(1) Complete these two questions independently.
(2) Observe these two questions carefully. What are the similarities?
(3) Why do all calculations use subtraction?
3. Assign homework
Homework: Exercise 2 on page 11, questions 5 and 7.
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"Ten minus 9" Abdication subtraction within 20 PPT courseware 4:
"Ten minus 9" Subtraction within 20 PPT courseware 4 Teaching objectives: Preliminarily master the calculation method of ten minus 9. Able to correctly perform verbal calculations of ten minus nine. Initial cultivation of students' abstract thinking ability. By thinking about addition and subtraction, we can initially penetrate the relationship between things.
"Ten minus 9" Abdication subtraction within 20 PPT courseware 3:
"Ten minus 9" Subtraction within 20 PPT courseware 3 Put it around and do the math. Which method do you prefer? How else can it be calculated? 9+( )=12; 12-9=( ). ... ... ... 13 goldfish, 8 are flowery and ( ) are black. 13 goldfish, black...
"Ten minus 9" Subtraction within 20 Flash animation courseware 3:
"Ten minus 9" Flash animation courseware of subtraction within 20, 3. This courseware helps students learn the knowledge points of subtraction from ten by nine in subtraction within 20 through exercises. It is a very good practice courseware. Keywords: Subtraction animation courseware within 20, ten..