I use my fingers.
I do too. My dad used to sing a very old ballad, called “My Mother’s Rosary” and some of the words went like this:
Ten baby fingers, ten baby toes,
she’d count them each and every one
and when her daily work was done
she’d count them by the setting sun,
They were my mother’s rosary...
BRB, I’m going to see if I can find the rest of the lyrics.