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.
If you don't have the time to provide feedback we'd really appreciate it if you could give this page a score! We are constantly improving and adding to these starters so it would be really helpful to know which ones are most useful. Simply click on a button below:
This starter has scored a mean of 3.4 out of 5 based on 56 votes.
Previous Day  This starter is for 21 April  Next Day
Teacher, do your students have
access to computers? 

Here is the URL for a concise version of this page without comments or answers.
Here is the URL which will take them to a related student activity.
Christmas Present Ideas
Seasonal, mathematicsrelated gifts chosen and recommended by Transum Mathematics