mathemateg
Yes, math is called maths in Welsh.
Mathemateg
"You are Welsh" = Rwyt ti'n Gymreig
'Our Friends' in Welsh is 'Ffrindiau Ni' :)
To say "your house" in Welsh, you would say "eich tŷ".
Cymraeg
No in Welsh is dim.
"y diwedd" is how you say it in Welsh language.
In Welsh, you would say "Rwy'n cytuno" to say "I agree."
In America it is math, in most European countries it is maths
Draig Gymreig
You can say "it's nice" in Welsh as "mae'n braf."