Puzzles - Number puzzles

Answer

:

9

Explanation

:

Take any group of 5 numbers along the side of the square, and their total is always 25.

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.

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.