The total number of possible sums is: 25.
Spinner has the numbers 4, 5, 6, 7, and 8 on its sides.
In this case, the number of possible sums can be calculated by multiplying the number of sides on each spinner.
General, if you have two spinners with n sides each, the number of different sums is n × n.
Since each spinner has 5 sides, the total number of possible sums is 5 × 5 = 25.