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1would be called a prime number because it cannot be divide by another number. On the other hand composite numbers can be divide by another number.And the third category is neither which can only be one number 0
Choose one number (other than zero). Then divide -60 by this number to get the other number.
To find the third number, divide the product of the three numbers by the product of the two known numbers. First, calculate the product of the known numbers: 13 × 15 = 195. Then, divide 2730 by 195: 2730 ÷ 195 = 14. Therefore, the third number is 14.
21 is a composite number, as it can be divided by 7 and 3. The other three numbers are prime numbers and do not divide into anything besides themselves.
A factor of a number will divide that number evenly. A common factor is any factor which two numbers share. One of the numbers here is 1. The only number that can divide evenly in to is 1. Therefore, it doesn't matter what the other number is, the HCF can only be 1.