Something similar happened to me on one of my childhood trips to Pk. We were talking about each others height. At that time I was 172 cm, so I said “aik sau bahattar centimetres” and my cousin, who had lived in Pakistan all her live, but had been educated English Medium goes: “Bahattar kya hota hai?” 
I myself have always lived outside Pakistan, but at least I do know my counting in Urdu.