8
23
15
If you mean the fraction 23/15, divide 23 by 15. The whole part will be the whole number; the remainder will be the numerator for the fractional part.
Subtract 8 from 38; divide by 2 for the first number; add 8 for the second number. Example: 38 - 8 = 30 / 2 = 15 (first number). 15 + 8 = 23 (second number). Proof: 15 + 23 = 38.
8
15-23 = -8
Each number is 8 more than the preceding number.
7
23-8 = 15
23 - 8 = 15
28
-7