Mathematics in french

We learnt simple mathematics in french today and it had been very very difficult. The process of thought just takes so long. In english, malay or mandarin, I can do 34-12 = 22 in 2 seconds. In french, it took me about 2 minutes to work out and say out the whole thing. I have to change the number from french to english, then calculate in english then translate the answer into french again. Seriously math has never been this hard for me ever...