HP: 11
AC: 13
Damage per round: 7
Attack bonus: 4 + 1 (for pack tactics) = 5

Defensive CR: 1/8
Offensive CR: 1
Average CR: 0.675 rounded = 1/2

HP: 45 x 2 (for damage resistances) = 90
AC: 14
Damage per round: 2 x 6 (longsword) = 12
Attack bonus: 4

Defensive CR: 2
Offensive CR: 1
Average CR: 1.5 rounded = 2

HP: 200 x 1.25 (for damage resistances) = 250
AC: 19 + 2 (magic resistance) + 2 (3 saving throws) = 23
Damage per round: 2 x 43 (angelic greatsword) = 86
Attack bonus: 12

Defensive CR: 12 + 3 (adjust for AC) = 15
Offensive CR: 13 + 2 (adjust for attack) = 15
Average CR: 15