A method of utilizing an 8-bit primary transform core matrix to decode/encode may include determining whether to use a first transform core matrix that is a DST-7 primary transform core matrix which is larger than or equal to 8-point and represented by 8-bits. When a result of the determination is to use the first transform core matrix, the method may include: (i) deriving the first transform core based on a set of unique numbers, and (ii) causing a target data block to be encoded or decoded using the derived primary transform core. The method may further include, when a result of the determination is to not use the first primary transform: (i) deriving a second transform core based on the same set of unique numbers, and (ii) causing the target data block to be encoded or decoded using the derived second transform core.