The challenge is to make 20 on your calculator using only six keys.
4  7    2  7  =  20 
5  +  7  +  8  =  20 
1  2  0  รท  6  =  20 
20 
How many different ways can you do this? You could try making a different total. Is there a limit to the possible totals? What if you could use seven keys or five keys?
Topics: Starter  Calculator
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.
Click here to enter your comments.
Previous Day  This starter is for 21 April  Next Day
Sign in to your Transum subscription account to see the answers
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=April21 However it would be better to assign one of the student interactive activities below. 

Here is the URL which will take them to a related student activity.
See the National Curriculum page for links to related online activities and resources.