Hours To Go

A Maths Starter Of The Day

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.

The current time is:


How many full hours are left until the end of the year?

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).

Hexadecimal Time

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

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.
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When will a thousand seconds from now occur?

On what date will a million seconds from now occur?

On what date will a billion seconds from now occur?

On what date will a trillion seconds from now occur?

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Laptops In Lessons

Teacher, do your students have access to computers such as tablets, iPads or Laptops?  This page was really designed for projection on a whiteboard but if you really want the students to have access to it here is a concise URL for a version of this page without the comments:


However it would be better to assign one of the student interactive activities below.

Laptops In Lessons

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


Student Activity

Curriculum Reference

See the National Curriculum page for links to related online activities and resources.


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