Kinda yes, kinda no. 60 is normal, 70 is 60 with 10's. 80 is normal, 90 is 80 with 10's.
So 66 would be 60 6(soixant[60] six[6]), 76 would be 60 10 6(soixante[60] seize[10 6]), 86 would be 80 6(quatre vingt[4*20 = 80] six[6]), 96 would be 80 10 6(quatre vingt[4*20 = 80] seize[16]).
Sorry if it sounds confusing.