Leaders Rangers made it 13 Premiership wins in a row with a 2-0 victory against St Mirren in Paisley thanks to goals from Kemar Roofe and Alfredo Morelos.
Celtic saw off Dundee United 3-0 at Celtic Park with goals from Ismaila Soro, David Turnbull and Odsonne Edouard.
St Johnstone and Hamilton Accies drew 0-0 at McDiarmid Park while Livingston v Aberdeen was postponed due to a frozen pitch.
Ross County moved off the bottom of the table with a 2-0 win over Hibernian at Easter Road with goals from Harry Paton and Oli Shaw.
Kilmarnock defeated Motherwell 2-0 at Fir Park. Greg Kiltie broke the deadlock and Danny Whitehall converted a penalty after Mark O'Hara was sent off.