In fact the errors can be any of these numbers multiplied by any fact of 10 as well (eg 09,90,900,9000 or 18, 180, 1800 etc)

If you look up the error amount in this table it will tell you what are the possible combinations of numbers which can be transposed to make up that error - eg if the error is 36 then the numbers could be 15 and 51 or 48 and 84 etc)

Difference=09 Amt1 Amt2 01 10 10 01 12 21 21 12 23 32 32 23 34 43 43 34 45 54 54 45 56 65 65 56 67 76 76 67 78 87 87 78 89 98 98 89

Difference=18 Amt1 Amt2 02 20 13 31 20 02 24 42 31 13 35 53 42 24 46 64 53 35 57 75 64 46 68 86 75 57 79 97 86 86 97 79

Difference=27 Amt1 Amt2 03 30 14 41 25 52 30 03 36 63 41 14 47 74 52 25 58 85 63 36 69 96 74 47 85 58 96 69

Difference=36 Amt1 Amt2 04 40 15 51 26 62 37 73 40 04 48 84 51 15 59 95 62 26 73 37 84 48 95 59

Difference=45 Amt1 Amt2 05 50 16 61 27 72 38 83 49 94 50 05 61 16 72 27 83 38 94 49

Difference=54 Amt1 Amt2 06 60 17 71 28 82 39 93 60 06 71 17 82 28 93 39

Difference=63 Amt1 Amt2 07 70 18 81 29 92 70 07 81 18 92 29

Difference=72 Amt1 Amt2 08 80 19 91 80 08 91 19

Difference=81 Amt1 Amt2 09 90 90 09