John Gill Commentary Numbers 2:24

"All that were numbered of the camp of Ephraim were a hundred thousand and eight thousand and a hundred, according to their hosts. And they shall set forth third." — Numbers 2:24 (ASV)

All that were numbered of the camp of Ephraim [were] an
hundred thousand and eight thousand and an hundred, throughout their
armies
108,100 men. Which was the smallest of all the camps, and near eighty thousand fewer than the camp of Judah, (Numbers 2:9) :

and they shall go forward in the third rank ;
and which was the first following the tabernacle.