Inclusive jet, dijet and trijet differential cross sections are measured [H1 Collab., DESY-14-089, [arXiv:1406.4709]] in neutral current deep-inelastic scattering (DIS) for exchanged boson virtualities 150<Q2<15000 GeV2 using the H1 detector at HERA. The data were taken in the years 2003 to 2007 and correspond to an integrated luminosity of 351pb−1. Jet cross sections are obtained using a regularised unfolding procedure. Normalised differential jet cross sections are also measured as the ratio of the jet cross sections to the inclusive neutral current cross sections in the respective Q2 bins of the jet measurements. The cross sections are used to determine the strong coupling constant αs=0.1165 (8)exp (38)pdf,theo.Trijet differential cross sections are measured [ZEUS Collab., ZEUS-prel-14-008] in neutral current DIS for 125<Q2<20000 GeV2 using the ZEUS detector at HERA. Good agreement between data and NLO calculations is observed.