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The number 130 can be expressed as the product of two numbers in various ways. One possible pair of numbers that multiply to 130 is 10 and 13, as 10 multiplied by 13 equals 130. Another pair could be -10 and -13, as -10 multiplied by -13 also equals 130. In general, the factors of 130 are all the possible combinations of two numbers that multiply to 130, including both positive and negative integers.
If the least common multiple of two numbers equals the product of the two numbers, then the numbers are relatively prime, that is their highest common factor is 1. For example, the numbers 10 and 21: The lcm is 10 x 21 = 210 They are relatively prime since their hcf is 1.
To find the LCM, you multiply the numbers together and then divide by the HCF. In this case, we don't know the numbers, but we have the HCF (13) and we have the product of the numbers (1690). Thus all you do is divide 1690 by 13 to get: 1690/13 = 130 And thus the LCM of two numbers whose hcf is 13 and product is 1690 is 130.
If the product of three numbers is 140, then we can write 140 as aXbXc. Let a be 10 and let b be 2. Then 140 equals 10X2Xc, or 7 equals c. Thus, the remaining number is 7.
The LCM of two numbers is sometimes the product of the two numbers.