In a golf tournament Ned was 4 under par on Saturday and 5 over or on Sunday. What is the difference

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In a golf tournament Ned was 4 under par on Saturday and 5 over or on Sunday. What is the difference in his score on Sunday compared to his score on Saturday

Givens and opening thoughts:

• Think of par as 0 or average.
• Under par is negative
• Over par is positive
• We have 4 under par as -4
• We have 5 over par as +5

The difference is found by subtracting:
+5 - -4
+5 + 4
9 strokes