Download Divisibility Rules and Prime Numbers

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Date: __________________
Divisibility Rules and Prime Numbers
I. Divisibility Rules:
2: last digit is 0,2,4,6 or 8
3: sum of digits is divisible by 3
4: two-digit number formed by the last two digits is divisible by 4
5: last digit is 0 or 5
6: number is divisible by both 2 and 3
8: three-digit number formed by the last 3 digits is divisible by 8
9: sum of digits is divisible by 9
10: last digit is 0
II. Prime Numbers
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A prime number is a number that has only two factors: 1 and itself.
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For example, 2 is a prime number. Its factors are 2 and 1.
Questions
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Is 1 a prime number?
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What do we call numbers that have more than 2 factors?
MMC Topic 2
Number Theory: Divisibility Rules and Prime Numbers
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Problem Sets: Divisibility Rules
Is the Number to the left of each row divisible by the Number at the top of each column?
Write YES or NO in the boxes.
2
3
4
5
6
9
69
70
21
92
74
25
10
15
75
22
225
480
422
567
918
711
MMC Topic 2
Number Theory: Divisibility Rules and Prime Numbers
2
Group Activity: Divisibility Rules
How many prime numbers are there from 1-100?
________________
Circle the prime numbers.
MMC Topic 2
Number Theory: Divisibility Rules and Prime Numbers
3