Predict: I predict that I will have to use subtraction.

Read: A single digit number belongs in each circle, and it must equal the difference between the two numbers it sits on. What number belongs in the shaded circle?

Clarify: nothing to clarify:

The big question: what number belongs in the shaded circle?

Mathematical toolbox: guess check and improve and have I seen a similar problem.

Solve: around the shaded circle there is a 2 and I worked out that above that is a 5, nest I needed to find out was 2 – x = and I figured out that x (algebra) = 7.

Summery: you have to read the question carefully to find out what this question means.