Podcast
Questions and Answers
How do we determine if a number is divisible by 2?
How do we determine if a number is divisible by 2?
- If it ends in 2, 4, 6, 8, or 0 (correct)
- If it ends in 1, 3, 5, 7, or 9
- If it is a prime number
- If it is odd
How do we determine if a number is divisible by 3?
How do we determine if a number is divisible by 3?
- If it is a multiple of 3
- If it is a prime number
- If the sum of its digits is divisible by 3 (correct)
- If it ends in 3, 6, or 9
What is the rule for divisibility by 4?
What is the rule for divisibility by 4?
- If it is a multiple of 4
- If the sum of its digits is divisible by 4
- If it ends in 4 or 8
- If the number formed by the last two digits is divisible by 4 (correct)
How do we determine if a number is divisible by 5?
How do we determine if a number is divisible by 5?
What is the rule for divisibility by 9?
What is the rule for divisibility by 9?
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Study Notes
Divisibility Rules
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A number is divisible by 2 if it ends in an even digit (0, 2, 4, 6, or 8).
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To determine if a number is divisible by 3, sum all of its digits. If the resulting sum is divisible by 3, then the original number is also divisible by 3.
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A number is divisible by 4 if the last two digits form a number that is divisible by 4.
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A number is divisible by 5 if it ends in either 0 or 5.
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For divisibility by 9, sum all of the digits of the number. If this sum is divisible by 9, the original number is also divisible by 9.
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