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"Understanding Factors, Prime Numbers, and Composite Numbers" Multiples and Factors PPT Courseware
teaching objectives
1. In the activities of independently writing calculation formulas and finding all factors of numbers from 1 to 10, experience the process of recognizing factors, prime numbers, and composite numbers.
2. Understand the factors. Among the natural numbers from 1 to 100, you can find all the factors of a certain natural number. Understand the prime (prime) numbers and composite numbers. You can judge whether a number is a prime number or a composite number. You can find all the factors within 100. prime numbers.
3. Be able to actively participate in learning activities, be willing to communicate with others about your practices and findings, and gain a successful experience.
review review
1. Look at the formula and talk about it.
12÷3=4 12 is a multiple of 3.
12÷4=3 12 is a multiple of 4.
2. 12 is a multiple of 3, which is also a multiple of 4. So 3 and 4 are what number 12 is?
1. Write 12 in the form of multiplying two numbers.
Multipliers are also called factors. The numbers 1, 2, 3, 4, 6, and 12 are all factors of 12.
Find all the factors of 18 and write them down.
1×18＝18
2×9=18
3×6=18
The factors of 18 are: 1, 2, 3, 6, 9, 18.
practice
1. Which of the following numbers are prime numbers? What are composite numbers?
67 72 89 93
2. Find all prime numbers among the natural numbers from 50 to 100.
51 52 53 54 55 56 57 58 59 60
61 62 63 64 65 66 67 68 69 70
71 72 73 74 75 76 77 78 79 80
81 82 83 84 85 86 87 88 89 90
91 92 93 94 95 96 97 98 99 100
Problem discussion
1. Are all even numbers composite?
2. Are all odd numbers prime?
3. How many factors does a prime number have at most?
4. How many factors does a composite number have?
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