(Practise Your Algebra)
If P = 10, Y = 11 and A = 4
Then:
P + Y = 21
5Y  A = 51
PYA = 440
A + A + A = 10Y  98
Have you included a variety of equations?
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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=April18 However it would be better to assign one of the student interactive activities below. 

Here is the URL which will take them to a self marking exercise on substitution.
See the National Curriculum page for links to related online activities and resources.