
68 can be reduced to 1 by using only the number four key and any of the operation keys.
For example:
68  4 = 64
64 ÷ 4 = 16
16 ÷ 4 = 4
4 ÷ 4 = 1
How many other numbers can be reduced to 1 using only the four key and any of the operation keys?
Topics: Starter  Arithmetic  Calculator  Investigations  Number
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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: Transum.org/go/?Start=March15 However it would be better to assign one of the student interactive activities below. 

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The 15th March is referred to as the 'ides of March' in a Shakespeare play. The date was notorious as the date of the assassination of Julius Caesar in 44 BC. The death of Caesar made the Ides of March a turning point in Roman history.
You can find more about the word ides in the comments of the Roman Numerals Starter.
A coin bearing the year 44 BC was discovered last year using a metal detector, with the date still legible. How can one be absolutely certain that the coin is fake?