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secondary 2 | Maths
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Date Posted: 4 years ago
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Now, the terminology "prime number" refers to the entire number being divisible by only 1 and itself. We consider the entire number, rather than the last digit only.
If Alan is correct, then the numbers 12, 22, 32, 42 and so on are prime numbers because they all end in 2. This does not make sense, right?
Let's think. 3 is a prime number. 5 is a prime number. But putting 3 in the tens place and 5 in the ones place, we see that 35 is not a prime number, even though their components 3 and 5 are both prime numbers. This is because we are considering the number as a single unit, rather than separate units.
If Alan is correct, then the numbers 12, 22, 32, 42 and so on are prime numbers because they all end in 2. This does not make sense, right?
Let's think. 3 is a prime number. 5 is a prime number. But putting 3 in the tens place and 5 in the ones place, we see that 35 is not a prime number, even though their components 3 and 5 are both prime numbers. This is because we are considering the number as a single unit, rather than separate units.
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Not exactly; because 33 can be written as 1 x 33 and 3 x 11, we say that 33 has FOUR factors, not two.
A prime number is a number whose ONLY factors are 1 and itself, where "itself" is an integer more than 1.
We can decompose 63 into 1 x 63, 3 x 21 and 7 x 9 and conclude that 63 has six factors.
A prime number is a number whose ONLY factors are 1 and itself, where "itself" is an integer more than 1.
We can decompose 63 into 1 x 63, 3 x 21 and 7 x 9 and conclude that 63 has six factors.
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