Puzzles - Number puzzles

Answer

:

16

Explanation

:

Working in columns, starting with the top number, add 4 to give the next value down, and add 5 to give the one under that.

Answer

:

11

Explanation

:

In each star, add together the top 3 numbers, and subtract the lower 2 numbers, to give the value in the centre of each star.

Answer

:

3

Explanation

:

In each row of the diagram, add the left and right hand digits together and add 2 to give the result in the centre.