PTBs are calculated based on the distance between home and school or college for the exact number of days the child attends school and takes account of a child’s current travel requirement.
Mae'r data sydd wedi'i gynnwys ym MALlC wedi’i seilio ar godau post disgyblion, felly maent yn berthnasol i ble maent yn byw yn hytrach na ble maent yn mynd i'r ysgol.