Local authorities have discretion to distribute the remaining 30% on the basis of a range of factors so that they can take account of individual school circumstances.
Mae gan awdurdodau ddisgresiwn i ddosbarthu'r 30 y cant sy'n weddill ar sail ystod o ffactorau, fel y gallan nhw gymryd amgylchiadau ysgolion unigol i ystyriaeth.