Leigh Griffiths grabbed a hat-trick and Charlie Mulgrew and Kris Commons were also on target as Premiership leaders Celtic beat Inverness CT 5-0 at Parkhead on Saturday.
Ryan Jack marked his return from injury by scoring the winner as second-placed Aberdeen defeated St Johnstone 1-0 at Pittodrie.
Motherwell, in third spot, saw off Hearts 4-1 at Fir Park. Iain Vigurs, Lionel Ainsworth, John Sutton and James McFadden got the goals, with Callum Paterson replying for the visitors.
St Mirren moved level on points with Kilmarnock thanks to a vital 2-0 win in Paisley, courtesy of late goals from Conor Newton and Gregg Wylde.
Ross County and Partick Thistle remain level on points near the foot of the table after a 1-1 draw in Dingwall. Kallum Higginbotham gave the Jags an early lead but Richie Brittain soon equalised.
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