Table of Contents
What are multiples of the factors of 15?
Factors of 15 include 3 and 5; multiples of 15 include 30, 45, 60 (and more).
What are the first 6 multiples of 15?
Write down the number 5 and keep adding 5 to it until you’ve written six numbers. The first six multiples of 7 are 7, 14, 21, 28, 35, and 42. The first ten multiples of 8 are 8, 16, 24, 32, 40, 48, 56, 64, 72, and 80. The first six multiples of 15 are 15, 30, 45, 60, 75, and 90.
What is the composite of 15?
Definitions
factors of 10: | 1 x 10, 2 x 5 | 10 is composite |
---|---|---|
factors of 13: | 1 x 13 | 13 is prime |
factors of 14: | 1 x 14, 2 x 7 | 14 is composite |
factors of 15: | 1 x 15, 3 x 5 | 15 is composite |
factors of 16 | 1 x 16, 4 x 4 | 16 is composite |
What are the multiples of 15 and 20?
Step 1: List a few multiples of 15 (15, 30, 45, 60, 75, 90, 105, . . . ) and 20 (20, 40, 60, 80, 100, 120, . . . . ) Step 2: The common multiples from the multiples of 15 and 20 are 60, 120, . . . Step 3: The smallest common multiple of 15 and 20 is 60.
What times what can equal 15?
1 x 15 = 15. 3 x 5 = 15. 5 x 3 = 15. 15 x 1 = 15.
What is a composite of 15?
Is 15 a prime numbers?
No, 15 is not a prime number. The number 15 is divisible by 1, 3, 5, 15. Since 15 has more than two factors, i.e. 1, 3, 5, 15, it is not a prime number.
Why is 15 not a prime number?
15 is not a prime number because the factors of 15 are 1, 3, 5 and 15 ( 15 has more than 2 factors, so it is not a prime number. There are an infinite number of prime numbers. The prime numbers under 30 are: 2, 3, 5, 7, 11, 13, 17, 19, 23, and 29.
What 3 numbers add up to 15?
Another approach is to consider the ways to obtain 15 as a sum of 3 different numbers in the range 1.. 9. These are: 1+5+9, 1+6+8, 2+4+9, 2+5+8, 2+6+7, 3+4+8, 3+5+7, 4+5+6. As you can see there are only 8 ways, and you need 8 different sums in your square.
What is a division problem that equals 15?
3 × 5 = 15.
How is 15 a prime number?
The number 15 is divisible by 1, 3, 5, 15. For a number to be classified as a prime number, it should have exactly two factors. Since 15 has more than two factors, i.e. 1, 3, 5, 15, it is not a prime number.