27
9, 9, 6
9, 8, 7
8, 8, 8
14
There are 165 of them and I do not have the patience to list them all.
51 Numbers30-9 is equal to the number of two digit numbers21*2=42Then you add the 9 single digit ones42+9=51
positive combinations:14 positive combinations not counting the same one just flipped:7 combinations including negatives: infinate
28
14
9+8+2=19 9+7+3=19 9+6+4=19 There are a limited number of possibilities but there are absolutely loads
There are 165 of them and I do not have the patience to list them all.
51 Numbers30-9 is equal to the number of two digit numbers21*2=42Then you add the 9 single digit ones42+9=51
20
positive combinations:14 positive combinations not counting the same one just flipped:7 combinations including negatives: infinate
28
To make the list of two-digit numbers with digits that add up to 10, first write the pairs of single-digit integers that add up to 10. They are (1,9), (2,8), (3,7), (4,6), (5,5). Then recognize that each of these pairs of numbers, except 5, can be combined in two different ways to make two-digit numbers that satisfy the problem. 19 and 91 28 and 82 37 and 73 46 and 64 55 So there are nine two-digit numbers with digits that add up to 10.
10
Five of them.
An infinite number of combinations of fractions can be aded together to equal three fourths.
To find the digit sum of a number you plus the first 2 numbers together, example:the number 18, 18 is made up of 2 digits 1 and 8.If you add the 2 digits together you get a total of 9.So that is the digit sum of 18.But if you use a higher number like 66 then the method has a small change.First if you add the two digits together it becomes 12.But 12 isn't a single digit sum.So again the 2 digits have to be added together to make a single digit sum.1+2=3 so 3 is the single digit sum for the number 66.