### Metric Time

The day is divided into 100 parts (centidays) and the time is given to three decimal places. Think of it as a percent of the day that has passed.

Mid-day will be 50.000 LMT (Local Metric Time) in metric Time.

?

### Mayan Time

The Mayans used a vigesimal (or base-20) numeral system. Mayan numerals use only combinations of dots (ones) and bars (fives) to form numerals for 1 to 19, and a stylised shell glyph for zero (not shown here).

The day is divided up into 65536 parts and written in hexadecimal (base-16) notation (A=10, B=11 ... F=15). The "0x" at the begining is just to signify that it is in hexadecimal notation, we could just leave it off or use some other signifier.

### Binary Time

Like hexadecimal time, the day is divided into 65536 parts, only we display it as a binary number using squares for bits, here using dark squares to represent 1 and white for 0.

### Octal Time

Octal Time uses a base-8 system (digits 0-7). The day is divided into 32768 parts for a total of 5 octal digits. The right-most digit updates about every 2.6 seconds (half the speed of hexidecimal time).

### Base 64 Time

Base-64 uses ASCII characters (in ascending order: A-Z, a-z, 0-1, +, and /).

Can you figure out how you would convert Base 64 time to mormal time?

The many digital clocks used on this page are adapted from the work of Lyle Zapato

## A Mathematics Lesson Starter Of The Day

Share

Topics: Starter | Time

• Mr Ditta and 9Y-Ma1, Stokesley School
•
• 9Y-Ma1 argue that you have failed to subtract 1 hour on the last sunday of October hence 1 hour needs to be added accordingly.
• Year 6, St. Philip's Uckfield
•
• We think that you have forgotten the extra hour when the clocks go back.
• Mary Brentnall, marybrentnall@hotmail.com
•
• What about the extra hour when the clocks go back?
• Transum,
•
• The extra hour has now been included in the answer. Thanks Mr Ditta and 9Y-Ma1 at Stokesley School, Year 6 at St. Philip's Uckfield and Mary Brentnall.
• Mr Trainor And His P7 Class(All Girls), Mercy Primary School, Belfast
•
• My Primary 7 class in Mercy Primary school, Belfast, look forward to your mental maths starters every morning. The variety of material is interesting and exciting and always engages the teacher and pupils. Keep them coming please.
• Josh, BCJS Year 6 6J
•
• At BCJS in Mr Jenkins maths group, on 21/10/13 at 12 o'clock. The majority of the class said the answer was 1717 hours until the end of the year. The method we did was 71 days x 24 hours = 1704 add 12 hours = 1716 add 1 hour because of the time change = 1717. So our last answer was 1717.

How did you use this starter? Can you suggest how teachers could present or develop this resource? Do you have any comments? It is always useful to receive feedback and helps make this free resource even more useful for Maths teachers anywhere in the world.

If you don't have the time to provide feedback we'd really appreciate it if you could give this page a score! We are constantly improving and adding to these starters so it would be really helpful to know which ones are most useful. Simply click on a button below:

Excellent, I would like to see more like this
Good, achieved the results I required
Satisfactory
Didn't really capture the interest of the students
Not for me! I wouldn't use this type of activity.

This starter has scored a mean of 3.1 out of 5 based on 179 votes.

Previous Day | This starter is for 21 October | Next Day

Javascript not working

Your access to the majority of the Transum resources continues to be free but you can help support the continued growth of the website by doing your Amazon shopping using the links on this page. Below is an Amazon search box and some items chosen and recommended by Transum Mathematics to get you started.

## Apple iPad Pro

The analytics show that more and more people are accessing Transum Mathematics via an iPad as it is so portable and responsive. The iPad has so many other uses in addition to solving Transum's puzzles and challenges and it would make an excellent gift for anyone.

The redesigned Retina display is as stunning to look at as it is to touch. It all comes with iOS, the world's most advanced mobile operating system. iPad Pro. Everything you want modern computing to be. more...

Before giving an iPad as a Christmas gift you could add a link to iPad Maths to the home screen.

## Math with Bad Drawings

I had been tutoring the wonderful Betsy for five years. When the day came for our last ever session together before the end of her Year 13, I received this beautiful book as a gift of appreciation.

This a very readable book by Ben Orlin. I'm really enjoying the humour in the writing and the drawings are great.

Ben Orlin answers maths' three big questions: Why do I need to learn this? When am I ever going to use it? Why is it so hard? The answers come in various forms-cartoons, drawings, jokes, and the stories and insights of an empathetic teacher who believes that mathematics should belong to everyone.

## A Compendium Of Mathematical Methods

How many different methods do you know to solve simultaneous equations? To multiply decimals? To find the nth term of a sequence?

A Compendium of Mathematical Methods brings together over one hundred different approaches from classrooms all over the world, giving curious mathematicians the opportunity to explore fascinating methods that they've never before encountered.

If you teach mathematics to any age group in any country, you are guaranteed to learn lots of new things from this delightful book. It will deepen your subject knowledge and enhance your teaching, whatever your existing level of expertise. It will inspire you to explore new approaches with your pupils and provide valuable guidance on explanations and misconceptions. more...

 Teacher, do your students have access to computers?Do they have iPads or Laptops in Lessons? Whether your students each have a TabletPC, a Surface or a Mac, this activity lends itself to eLearning (Engaged Learning).

Here a concise URL for a version of this page without the comments.

Transum.org/go/?Start=October21

Here is the URL which will take them to a related student activity.

Transum.org/go/?to=clockpairs

For Students:

For All: