Just one: 11 = 1 x 11
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225 has five factor pairs:225,175,345,525,915,15
There are 3 factor pairs of 99.99 = 1 x 9999 = 3 x 3399 = 9 x 11
The factor pairs of 32 are:1 × 32 = 322 × 16 = 324 × 8 = 32The factor pairs of 44 are:1 × 44 = 442 × 22 = 444 × 11 = 44
If you include fractions and decimals, then there are aninfinite number of such pairs, so they can't be listed.If you're satisfied to limit the discussion to whole numbers,then the pairs are:1 x 555 x 11-1 x -55-5 x 11
The factor pairs for 77 are (1,77) and (7,11).