It Figures

NO.21

INSTRUCTIONS Using the clues below place the numbers 1 to 16 correctly in the grid. How many clues do you need?

LEVEL 1 – CHIEF SCIENTIST

1 Every composite number less than 15 is adjacent to exactly two of its factors. The only non-prime number in Row A is the highest in that row.

The numbers in Row D are all divisible by 3.

4 The product of the down sloping diagonal is 30.

5 The sum of the last two numbers in Column 1 is 26.

LEVEL 2 – SENIOR ANALYST

6 The numbers in Row B are all even.

7 The number beginning Column 1 is half as

big as the number directly below it.

LEVEL 3 – LAB ASSISTANT

8 There are two square numbers in Column 4.