Puzzles - Number puzzles

247.
Answer
:
9
Explanation
:
Take any group of 5 numbers along the side of the square, and their total is always 25.

248.
Answer
:
29
Explanation
:
In each diagram, add up the 4 outer numbers then add 2 for the left hand group, 4 for the next, then 6, then 8, and put this result in the central circle.

249.
Answer
:
1
Explanation
:
Calculate the sums of the numbers in the left and right hand circles, to give 2 digit answers. Write the left hand answer in the top 2 segments of the central circle, and put the right hand answer in the bottom 2 segments of the central circle.