note that no other relationships are to be used in developing this work (e.g. the line total being 3 x middle number and the leading diagonal going up in a linear sequence are

__not__to be used)

students might need help in appreciating that when a column and a diagonal line have a common 'intersection' then the other pairs of numbers must have the same total

once a line of 3 has been found the square is usually easy to complete

find two reasons why the bottom right number must be 4 then complete the remainder...

students could go on to explore what happens when 3 (different) numbers are placed anywhere on the grid (but not in a line)...

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