Topics: Starter  Arithmetic  Number
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Tip For Teacher
Most people don't know all of the wonderful things our calculators can do. There are just so many buttons and functions.
Do you have this strange FACT function on your calculator? Do you know what it does?
Type a number (48 is a good example) into the calculator then press the equals button.
Next press shift then this button with FACT written over it.
You should now see 2^{4} × 3 in the calculator display.
The function performed the prime factorisation of 48.
Very useful.
So this button can be used to find out if a number is a prime number as the prime factorisation function will return the original 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=August22 However it would be better to assign one of the student interactive activities below. 

Here's the URL which will take them to an activity called Pentransum.
See the National Curriculum page for links to related online activities and resources.