My daughter just figured the relationship between numbers and chores.
When I ask my children to tidy up, I give them a number and that is how many things they have to pick up and put away. This evening I asked Miss T to pick some toys up. She asked how many. I told her to pick a number, a couple of seconds passed and she started to giggle. I looked at her and she said, I was going to say 1. I said she needed to choose more than 4 (because that is how old she is) she said 5.
Conclusion - she is not stupid.