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Age 11 to 14 Short
Challenge Level
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.
This problem is taken from the UKMT Mathematical Challenges.
You can find more short problems, arranged by curriculum topic, in our short problems collection.
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NRICH is part of the family of activities in the Millennium Mathematics Project.
NRICH is part of the family of activities in the Millennium Mathematics Project.