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.
Disgyblion mewn ysgolion sydd â chod post cartref mewn 20% o'r ardaloedd mwyaf difreintiedig ym Mynegai Amddifadedd Lluosog Cymru 2019, ym mis Ebrill 2021