You've only got a leaflet there....you left the rest of the leaf on the tree.

Check Ailanthus altissima.

Yes - Ailanthus altissima.

Oh, my bad i am sorry. Here, i came back to get this. :-) but I searched for Ailanthus altissima and it does look like it! Thank you so much. We are doing a research for 15 leaves in our school, and I lack one more thank you @peren.all and @floral_uk you both helped me a lot. Thanks so much!

You may have noticed the odor of the foliage which is distinctive!

"stems and some flowers have a strong, unpleasant to offensive odor likened to cat urine or rotting peanuts or cashews"

https://www.nps.gov/plants/ALIEN/pubs/midatlantic/aial.htm