The factor pairs of 12 are (12,1), (6,2), and (4,3)
The factor pairs of 18 are (18,1), (9,2), and (6,3)
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12 and 18 have three factor pairs.
"Dose" is a measured portion of a medicine. I am not aware of any factor pairs related to dose 18 or any other measured quantities of medication!18 does have 3 factor pairs.
The factor pairs of 18 are (1 x 18), (2 x 9), (3 x 6)
The factor pairs of 36 are pairs of numbers that multiply together to equal 36. These pairs include (1, 36), (2, 18), (3, 12), (4, 9), and (6, 6). Factors are numbers that can divide evenly into a given number, and in this case, 36 has a total of 9 factor pairs.
To find factor pairs of a number, you divide that number by each integer in turn. If the number divides evenly, you take that divisor, and its answer, as a factor pair. 36 can divide by 1, 2, 3, 4, 6, 9, 12, 18 and 36. Thus the factor pairs are 1 and 36, 2 and 18, 3 and 12, 4 and 9, and 6 and 6.