Podcast
Questions and Answers
Name the first twenty prime numbers.
Name the first twenty prime numbers.
2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71
Name the first twenty composite numbers.
Name the first twenty composite numbers.
4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 25, 26, 27, 28, 30, 32
The number 1 is a prime number.
The number 1 is a prime number.
False (B)
The number 2 is the smallest prime number and the only even prime number.
The number 2 is the smallest prime number and the only even prime number.
Two prime numbers are always co-primes, but two co-primes may not be prime numbers.
Two prime numbers are always co-primes, but two co-primes may not be prime numbers.
What are the first five consecutive composite numbers?
What are the first five consecutive composite numbers?
The divisibility rule of three is: Add all the digits of the number, if it is divisible by ______, then it is divisible by three.
The divisibility rule of three is: Add all the digits of the number, if it is divisible by ______, then it is divisible by three.
The divisibility rule of four is: If the last two digits are divisible by ______, then it is divisible by four.
The divisibility rule of four is: If the last two digits are divisible by ______, then it is divisible by four.
Describe the divisibility rule of seven.
Describe the divisibility rule of seven.
Divisibility rule of eight is: if the last ______ digits of the number is divisible by eight, then it is divisible.
Divisibility rule of eight is: if the last ______ digits of the number is divisible by eight, then it is divisible.
The divisibility rule of nine is: If you add all the digits in the number, and the sum is divisible by ______, then it is divisible.
The divisibility rule of nine is: If you add all the digits in the number, and the sum is divisible by ______, then it is divisible.
HCF x LCM of two numbers = ______ of the numbers.
HCF x LCM of two numbers = ______ of the numbers.
Flashcards
Prime Number
Prime Number
A whole number greater than 1 that has only two factors: 1 and itself.
Composite Number
Composite Number
A whole number greater than 1 that has more than two factors.
Divisibility Rule of 3
Divisibility Rule of 3
Add all the digits of a number. If the sum is divisible by 3, then the original number is divisible by 3.
Divisibility Rule of 4
Divisibility Rule of 4
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Divisibility Rule of 7
Divisibility Rule of 7
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Divisibility Rule of 8
Divisibility Rule of 8
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Divisibility Rule of 9
Divisibility Rule of 9
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Co-primes
Co-primes
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Smallest prime number
Smallest prime number
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HCF
HCF
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LCM
LCM
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HCF x LCM
HCF x LCM
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Number 1
Number 1
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Consecutive Composite Numbers
Consecutive Composite Numbers
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Two prime numbers
Two prime numbers
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Two co-primes
Two co-primes
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Study Notes
Prime and Composite Numbers
- First twenty prime numbers: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71
- First twenty composite numbers: 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 25, 26, 27, 28, 30, 32
- 1 is neither prime nor composite
- 2 is the smallest prime number and the only even prime number
- Two prime numbers are always coprime, but coprime numbers may not be prime
Divisibility Rules
- Divisibility by 3: Sum of digits is divisible by 3
- Divisibility by 4: Last two digits are divisible by 4
- Divisibility by 7: Multiply last digit by 2, subtract from the rest of the number, if the difference is 0 or a multiple of 7, then divisible
- Divisibility by 8: Last three digits divisible by 8.
- Divisibility by 9: Sum of the digits is divisible by 9
Relationship between HCF and LCM
- HCF (Highest Common Factor) x LCM (Lowest Common Multiple) of two numbers = Product of the numbers
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