Puzzles - Number puzzles

Answer

:

253

Explanation

:

Starting at the top left, and moving through the diagram in a Z shape, double each number and add 3 to give the next number along.

Answer

:

51

Explanation

:

Moving to the right, double each number and subtract 3 to give the next number along.

Answer

:

2

Explanation

:

Starting with the 10 at the top, one set of numbers increases by 3 each time, written in alternate boxes as you move down the diagram, and the other set of numbers decreases by 2, written in the boxes remaining.