This is not a Duo sentence, but I came across this and don't understand the number.
It means 712,900 square kilometers. I don't understand the 点 in the number and why the 万 （10,000) is at the very end. Wouldn't 712,900 be something like 七百十二万九百 because 12 is 十二？
It's similar to how we say 0.7129 million in English, but Chinese uses 万 (ten thousand) as convention, thus 七十一点二九万 translates to 71.29万. The 点 indicates the dot/point. 七百十二万九百 is not correct, it should be 七十一万二千九百. Hundred thousand does not equal to 百万.
So the answer of 712,900 given by the exercise as the correct answer is a mistake? I need to learn Chinese numbers better. Some of them seem so logical, and some of them seem confusing to me. I think I see where you get 七十一万二千九百.... 70 before 10,000+2,900 although google translate says that is 721,900!
Unfortunately google translate is wrong... as 七十一点二九万 equals to 71.29万 and 一万 is ten thousand, 七十一点二九万 does translate to 712,900. I understand how confusing it is though, as a native Chinese speaker myself, I sometimes get confused by English numbers too!
Thanks so much for your help! I understand how you get 712,900 now I think. It's like 71.29 x 10,000. It really is nice to have native Chinese speakers like yourself here in this forum!