The Closure Property states that when you perform an operation (like addition, subtraction, multiplication, or division) on two numbers from a particular set, the result should also belong to that set for the property to hold.
For rational numbers, the Closure Property for addition states that the sum of any two rational numbers is also a rational number.
If you provide specific sums, I can help you determine which of them results in a rational number according to the Closure Property.