# From the Mathematics Department

Some Maths Trivia! Courtesy of the Maths Prefect – Anthea Michalopoulos (Yr 12)

How many can you do?

(Answers at the end of the newsletter)

1. How can 0.99999… = 1?

2.  Maths trick:

(i) Multiply your age by 7.

(ii) Multiply that answer by 1443.

The answer will always show your age repeated three times

3. Multiply 37,037 by any single number (1 – 9), then multiply that number by 3.

Every digit in the answer will be the same as that first single number.

4. Did you know?

One Googol is the number 1 followed by 100 zeros. The name ‘googol’ was invented by a child (Dr. Kasner’s nine-year-old nephew) who was asked to think up a name for a very big number, namely, 1 with a hundred zeros after it.

There’s not enough space in the known universe to write out a googolplex on paper. A googolplex is 10 to the power of a googol, or 10 to the power of 10 to the power of 100.

5. 10! (that means 10 factorial) seconds is exactly 6 weeks.

10! is 10 factorial. i.e. 10! = 10 × 9 × 8 × 7 × 6 × 5 × 4 × 3 × 2 × 1 = 3628800 seconds.

This is is 42 days, or 6 weeks, exactly