Ireland showed their experience and class in the second half, with two quick-fire tries around the hour mark killing off the hopes of the Scots, who didn’t manage to score a point after the break.
After Hansen took an up-and-under on the right flank, the ball was recycled to the left and, after a series of phases, Jamison Gibson-Park’s miss-pass found winger James Lowe, who barged through a challenge to ground in the corner in the 57th.
Five minutes later, Hansen also played a key role in Ireland’s third try by sending in replacement Jack Conan along the right touchline. The back-row forward had the huge figure of Duhan van der Merwe to hold off, but he did and got over the line.
One more try was needed to claim a fourth straight bonus-point win this tournament and it nearly arrived after a length-of-the-field move. It ended with flanker James Ryan tackled about 5 metres out and his offload just evading Lowe.
Ireland centre Garry Ringrose will surely not be playing against England next weekend after appearing to lose consciousness making a tackle with around 10 minutes remaining.
After a lengthy period of treatment, he was carried off on a stretcher to applause around the ground.
The last of Ireland’s three Grand Slams in the championship was in 2018.