Yes, in Mandarin, the number 5 is wǔ (五), and the number 10 is shí (十). The number 50 is written as 五十 (I tend to read it as 5*10, or “five-tens” as you put it

Yes, in Mandarin, the number 5 is wǔ (五), and the number 10 is shí (十). The number 50 is written as 五十 (I tend to read it as 5*10, or “five-tens” as you put it). I think it makes some simple math concepts easier to understand.