List two months which have 31 days. The figure below is a triangle. Find its perimeter. Using a sharp pencil, a ruler and a pair of compasses, construct a line segment WK = 6cm.

Side 1 = $13 \text{ cm}$
Side 2 = $13 \text{ cm}$
Side 3 = $13 \text{ cm}$

The perimeter is $\boxed{\text{39 cm}}$.

11. Using a sharp pencil, a ruler and a pair of compasses, construct a line segment WK = 6cm.

The line segment WK is now constructed and measures $6 \text{ cm}$.

12. Given that set H={a, er, y, ng, b}. How many members are in set H?

The elements are 'a', 'er', 'y', 'ng', 'b'.

There are 5 distinct elements.
The number of members in set H is $\boxed{5}$.

13. Workout $3 \times 5$ using repeated addition.

To workout $3 \times 5$ using repeated addition, we can either add 3 five times or add 5 three times.

Method 1: Add 3 five times

Method 2: Add 5 three times

The result of $3 \times 5$ using repeated addition is $\boxed{15}$.

14. List all odd numbers less than 14.

An odd number is an integer that is not divisible by 2.

1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13.

The odd numbers are those that cannot be divided evenly by 2.
The odd numbers less than 14 are $\boxed{1, 3, 5, 7, 9, 11, 13}$.