### 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.

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### 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?

## A Mathematics Lesson Starter Of The Day

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
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• We think that you have forgotten the extra hour when the clocks go back.
• Mary Brentnall, marybrentnall@hotmail.com
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• 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.

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

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 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).

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: