Predict: I predict that this question will be about addition.
Read: Enter numbers in the circles so that the sum of the numbers on each line equals that sum of the numbers at each end.
Big question: The big question is what are the missing numbers
Mathematicians toolbox: The strategy I used from the mathematicians toolbox was to test all possibilities.
Solve: I solved this by testing all possibilities until I got the answer.
Summary: At the start it looked hard but when you got into it its actually quite easy.