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What is the sum of all odd numbers between 3 and 45 which are factors of 3?
The only number between 3 and 45 which is a factor of 3 is 3. There are several multiples of 3 beyond this.
Do only square numbers have an even number of factors?
No, only square numbers have an odd number of factors.
Can an odd number have odd numbers of factors?
Yes. Square numbers have an odd number of factors. 49 has three factors.
Can odd numbers be composite?
If an odd number has more than two factors then it is a composite number but if it has only two factors then it is a prime number. Although all prime numbers are odd except for 2 many more odd numbers are composite numbers having more than two factors as for example 21 is an odd number whose factors are 1, 3, 7 and 21.
Why aren't all odd numbers divisible by 3?
Because not all odd numbers are multiples of 3 - I have shown you below that this is the case and you can see some multiples of 3 are even and some are odd and you can also see that there are even and odd numbers BETWEEN the multiples of 3. 1 (odd) 2 (even) 1*3 =3 (odd) 4 (even) 5 (odd) 2*3 = 6 (even) 7 (odd) 8 (even) 3*3 = 9 (odd) 10 (even) 11 (odd) 4*3 = 12 (even)
What numbers that are less than a hundred have proper factors that are only odd numbers?
Numbers that are prime can't be multiples of 10. Multiples of 10 can't be odd.
Odd numbers with a multiple of 3 and not a factor of 8?
All odd multiples of 3 are not factors of 8.
Are there any numbers that have only odd multiples?
No No
Are all odd number divisible by 5?
No. Only odd numbers that are multiples of five.
Why are all multiples of 3 odd and even?
The multiples of all odd numbers are odd and even. Odd x odd = odd. Odd x even = even. Since odd and even numbers alternate, the multiples will alternate as well.
Are all multiples of 3 odd?
No - alternate multiples of 3 are odd, and alternate multiples are even.
How many odd prime factors are there in 56?
56 = 2^3*7 so the only odd factors (apart of 1) is 7.
Which number from ten to twenty has an odd number of factors?
Only perfect squares can have an odd number of factors. The answer is 16. It has five factors: 1,2,4,8,16.
Is all multiples of three odd?
No, there is 6, 12, 18, 24 and so on so forth. Only half of them are odd.
Are All multiples of 40 are multiples of 80?
Not all multiples of 40 are multiples of 80. Only the even multiples of 40 are also multiples of 80. The odd multiples, e.g. 40, 120, 200, 280, and 360, are not multiples of 80.
What are all the odd numbers up to 5000 that are multiples of 4?
No odd numbers are multiples of 4.
What is the sum of all odd numbers between 3 and 45 which are factors of 3?
The only number between 3 and 45 which is a factor of 3 is 3. There are several multiples of 3 beyond this.
