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"Least Common Multiple" PPT courseware on the meaning and properties of fractions
1. Establish concepts in activities
1. Please ask students whose student ID is a multiple of 4 to stand up and state their student ID. Students whose student IDs are multiples of 6 are asked to stand up and report their student IDs.
2. Question: What did you discover through the activity just now?
3. Question: Why do students with student numbers 12 and 24 stand up twice?
4. Can you find the student number of a student who is both a multiple of 4 and a multiple of 6?
2. Independent exploration and mastering methods
1. If you are given two numbers, can you find a way to find their least common multiple?
2. How to find the least common multiple of 6 and 8?
3. ①Please find the least common multiple of 6 and 8 yourself.
② Share your methods with your classmates.
3. Consolidate practice and improve understanding
1. Find the least common multiple of 8 and 10 using your favorite method.
2. Find the lowest common multiple of each set of numbers below. What did you find?
3 and 6 2 and 8 5 and 6 4 and 9 3 and 9 5 and 10
After students complete the work independently, they can communicate in groups.
To summarize the law of improvement: if two numbers are relatively prime, the least common multiple is their product; if the two numbers are multiples, the larger number is their least common multiple.
3. The least common multiple of two numbers is 12. These two numbers may be ( ) and ( ).
4. Reflect and review, improve understanding
What did you gain from today's study? Do you still have any questions?
5. Assign homework
Homework: Exercise 17 on page 71, questions 1, 2, 3, and 5.
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