140/420 and 1400/4200 are two simple ones to generate.
1/7 is one of the infinite number of fractions equivalent to 6/42. Others are 2/14, 3/21, 4/28, and so on.
9/1418/2890/14027/42
28/42 divide both by 2 = 14/21 divide both by 7 = 2/3
Two equivalent fractions for 21/35 are: 42/70, 3/5.
Equivalent fractions of 21/27 = 7/9, 42/54, 63/81,...
28/34, 42/51
10/28, 15/42
28/54, 42/81
28/34, 42/51
1/7 and 2/14
If you mean 42 then as improper fractions they are 42/1 and 84/2
27/42 = 9/14 or 18/28
11/14 = 22/28 33/42 44/56 726/924
4 and 2/3 = 14/3 = 28/6 = 42/9
30/42 = 5/7 = 10/14
14/42 = 1/3, 2/6, 3/9 and so on.
two fractions are equivalent 21 over 23 = 42/46, 63/69