1 x 100, 2 x 50, 4 x 25, 5 x 20, 10 x 10, 20 x 5, 25 x 4, 50 x 2, 100 x 1
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20 has 3 factor pairs. Pairs are (1,20), (2,10) and (9,9)
1 The factor pairs of 100 are 1 and 100, 2 and 50, 4 and 25, 5 and 20, and 10 and 10. The factor pairs of 49 are 1 and 49, and 7 and 7. Since the only factor they share is 1, 1 is their greatest common factor.
There is no order to factor pairs: you can present them in any order that you like.
"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.
1 and 500, 2 and 250, 4 and 125, 5 and 100, 10 and 50, 20 and 25, a total of 6 factor pairs.