The value of the missing number in the expression is 241.
What is an expression?
Expression in maths is defined as the collection of the numbers variables and functions by using signs like addition, subtraction, multiplication and division.
Let the missing number be x. Solve the expression for the missing number.
247 + 794 = x +800
1040 = x + 800
x = 1041 - 800
x = 241.
Hence, the number is 241.
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