Puzzles - Number puzzles

Answer

:

1

Explanation

:

Working through the diagram in rows, the central value equals the sum of the other numbers in the row.

Answer

:

8

Explanation

:

Multiply the 2 numbers in the outer segments together and add 1 to give the value in the inner segment opposite.

Answer

:

3

Explanation

:

Split each grid into 2 halves, vertically, leaving 2 columns, each 2 squares wide. Start with the top left pair and move down, then to the top right pair, and down again. Reading each pair of digits as 2 digit values, the 2 digit values increase by 11, 12, 13, 14 and 15.