Final answer:
To complete the sum, subtract the calculated sum from the given number and find the value of U. The number that should go in the red box is 0.07.
Step-by-step explanation:
In the given sum, 2 + 0.5 + U 1 100 7, we need to find the value of U to complete the sum. In order to do that, we need to calculate the sum of the given numbers first. So, 2 + 0.5 + 1 100 7 = 2.57. Now, to find the value of U, subtract the sum we calculated from the given number: 2 + 0.5 + U 1 100 7 - 2.57 = U.
Ignoring the typos, the given sum is 2 + 0.5 + U 1 100 7 = 2.57. Rearranging the equation, we get U = 2.57 - 2 - 0.5 = 0.07.
Therefore, the number that should go in the red box to complete the sum is 0.07.