A subtraction of this estimate from that for all statutory school-age residents yielded an indication of the number of children potentially missing from the education system on 20 April 2021.
Roedd tynnu’r amcangyfrif hwn o’r amcangyfrif ar gyfer yr holl drigolion oedran ysgol statudol yn rhoi syniad o nifer y plant a allai fod ar goll o’r system addysg ar 20 Ebrill 2021.