Which of the numbers from one to twenty can you make with the digits:
4, 5, 6 and 7
You can use any mathematical operations but you must use all four digits once in each calculation.
Example 20 = 4(7  6) x 5
Topics: Starter  Arithmetic  Mental Methods  Problem Solving
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Previous Day  This starter is for 15 April  Next Day
4, 5, 6 and 7
1 = 
11 = 
There are many different answers. These are not the only ones
1 = (7  6)(5  4) 
11 = 75  64 
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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=April15 However it would be better to assign one of the student interactive activities below. 

Here is the URL which will take them to a different type of mental maths activity.
Here is the URL which will take them to a similar 4 digit calculation challenge.
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