Multiplication Table Puzzle
Age 11 to 14 Short
In the multiplication table on the right, the row and column headings are all missing, and only some of the products in the table are filled in.
All the numbers in the table are positive integers.
What is the value of $A+B+C+D+E$?
If you liked this problem, here is an NRICH task
that challenges you to use similar mathematical ideas.