Math 4 - E. Noor, E. Nurk, A. Telgmaa
Math 5 - E. Nurk, A. Telgmaa --> same authors, listed in same order as Math 6, not sure if Telgmaa was only a co-author though.
Also:
Math 7 - E. Nurk, A. Telgmaa, A. Undusk, However A. Undusk is mentioned as principal author in some sources.
Math 8 - M. Lepik, E. Nurk, A. Telgmaa, A. Undusk,
Each of those comes with 1 or 2 workbooks.