1 x 21 3 x 7 7 x 3 21 x 1
1x82x4
Infinite
6 x 7 2 x 21 3 x 14
Infinitely many.
70*1.1 is one example.
3 are the ones i counted
How about: 5*9 = 45 as one example
Any, and every, multiplication problem must be "less than equal to or greater than one".
2.5 x 2 and 1 x 5
As many as desired. An infinite number is possible.
1 x 41, 41 x 1