Numbers

Let's count our chickens as they hatch.
First things first: Some of the Greek numbers are declined, most are not, i.e. (Latin id est for that is) most are invariable, ouff!
We'll decline them later on. For now, just learn the numbers.
  1. εἵς , μία , ἕν  
    • εἵς ἵππος
    • μία κόρη
    • ἕν δένδρον
    as opposed to:
    no, none, not any: οὐδείς , οὐδεμία , οὐδέν
    • οὐδεὶς ἄνθρωπος
    • οὐδεμία γυνή
    • οὐδὲν θέατρον
  2. δύο
  3. τρεῖς , τρεῖς , τρία  
    • τρεῖς υἱοί
    • τρεῖς θυγατέρες
    • τρία δένδρα
  4. τέτταρες , τέτταρες , τέτταρα
    • τέτταρες δοῦλοι
    • τέτταρες ὑδρίαι
    • τέτταρα ἄροτρα
  5. πέντε δάκτυλοι ἐν μίᾳ χειρί  in/on one hand
    The Pentagon has 5 γωνίας (angles)
  6. ἕξ  hexadecimal
  7. ἑπτά ἡμέραι  in one week
    a heptameter (line or verse of seven metrical feet)
  8. ὀκτώ  an octopod and an octopus both have  ὀκτὼ πόδας  eight feet, suckered arms really. We had:
       φεῦ τοῦ ποδός Ouch, my [poor] foot!
  9. ἐννέα Μοῦσαι 
  10. δέκα δάκτυλοί εἰσι τοῖς ἀνθρώποις people have 10 fingers (normally)
    decathlon, athletic contest of ten events (τὸ ἆθλον contest; prize)
  11. ἕνδεκα  easy:  ἕν  plus  δέκα
  12. δώδεκα  δύο  plus δέκα
    Say it fast and  δύο  becomes δώ , then fix it in your ears as  δώδεκα