eid_takbeer Eid Takbeer includes: Takbeer (saying Allahu Akbar اللهُ أَكْبَر), tahleel (saying la ilaha illa Allah لَا إِلَهَ إِلَّا الله) and taḥmeed (saying walillahi alḥamd وللهِ الْحَمْد which is basically saying alḥamdu lillah الحمد لله or thanks God). It is known as Eid Takbeer because we say it on the Eid day whether it is Eid Alfitr (after Ramadan) or Eid Aladḥa (on the 10th day of thul hijjah.
It is sunnah to say them during the first days of thul hijjah until the sunset of day 13.

Below is the Arabic script for the takbeer, the transliteration and Arabic translation. Here you can find a YouTube link on how you say them.

اللهُ أَكْبَرُ ،اللهُ أَكْبَرُ، اللهُ أَكْبَرُ… لَا إِلَهَ إِلَّا اللهُ

اللهُ أَكْبَرُ، اللهُ أَكْبَرُ … وللهِ الْحَمْدُ

Allahu akbaru, Allahu akbaru, Allahu akbar … laa ilaha illa Allah.

Allahu akbaru, Allahu akbar … wa lillahi alḥamd

Allah (God) is the Greatest (3 times), [there is] no god but Allah.
Allah (God) is the Greatest (2 times), all praise belongs to Allah (God).

Don’t wait. A few days left before Eid, learn the words and teach them to your kids. Spend some time after salah and say them together :). And for your kids, we have created two colouring worksheets in a PDF format. One is for Eid Takbeer in Arabic script, and another one for transliteration with the English meaning in this LINK