If you're restricting your numbers to integers, the composite numbers between 20 and 25 are 21, 22, and 24. The number 21 has no 2-digit divisors, so the two combinations are
... 11×2 = 22
... 12×2 = 24
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If you allow non-integer decimal numbers there are about 124 possible combinations (too many to list here). A few of them are ...
... 67×.3 = 20.1
... 53×.4 = 21.2
... 4.5×5 = 22.5
... 3.1×8 = 24.8
... 2.7×9 = 24.3
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If you allow 4.0 as a 2-digit number, then 4.0×6 = 24 and 6.0×4 = 24 are 2 of 6 such combinations that can be added to the list.
