#### Number Grids

Instructions: Draw a 3x3 grid. Then arrange the numbers 1 through 9 in the grid so that all of the conditions in the puzzle are satisfied.

Puzzle #1

The number in the lower left corner is 4 times the number in the upper right corner.

The 9 is between the 5 and the 8. (on a straight line)

There is a column in which the sum is equal to the product.

The 4 is between the 9 and the 3. (on a straight line)

No prime number is immediately to the left of a prime number.

Puzzle #2

The number in the lower left corner is the sum of the numbers in all the other corners.

There is a column with a sum of 10.

No even number is immediately to the left of another even number.

One row has a product of 30.

There is a row with a sum of 21.

No odd number is immediately below another odd number.

Puzzle #3

There is a row, column, or diagonal in which the sum and the product are equal.

4 is between 2 and 5.

6 does not share a row, column, or long diagonal with 7.

3 is between 4 and 8.

The sum of one of the long diagonals is odd.

There is a number in the left-hand column that is 3 times the number in the lower right corner.

Puzzle #4

3 does not share a row, column, or long diagonal with 1 or 4.

The bottom row has a sum of 20.

The column on the right has a sum of 7.

There is a row which contains only prime numbers.

The column on the left has a sum of 16.