# Labeling Venn Diagram with pattern for 8 year olds?

My 8 year old son came asking me to help with his homework and was given the following question. I think I am usually good at math but I don't see any pattern here.

1. Label the two circles of the Venn Diagram according to the sorting rule that was used.

(Note there weren't any rules given for this question. However, some other unrelated patterns were used for other Venn diagrams such as greater than less than, odd or even in the same lesson). 1. Add these numbers to the Venn Diagram 11, 4369.

Can anyone explain what is so simple that I and my son are missing here?

• 2-digit vs 3-digit numbers? – Don Thousand Oct 15 '18 at 1:26
• What about question two? That wouldn't fit. I mean you could say numbers with two digits vs numbers with more than three. Unless the second question doesn't fit and it is a trick question. – jwize Oct 15 '18 at 1:26
• It's probably some semi-arbitrary rule like "numbers less than 100 to the left" or "numbers that end in 3, 5, 9" to the left. – Fabio Somenzi Oct 15 '18 at 1:55