Learning Kanji for numbers...　(japanese to english and back)

Japanese to English
1. 六百五十 650
2.千八百 1,800
3.七十一万四千 714,000
4.十二万四三千 123,000
5.三千九百万<strike> 3900,000 </strike>　39,000,000

English to Japanese
1.30　三十
2.140　百四十
3.251　二　百　五十一
4.6,070　六千七十 　
5.8,190　八千百九十
6. 42, 500　四<strike>十</strike>　万　二千五百
7. 168,000　<strike>百六</strike>十　六万　八千
8. 3,200,000　三<strike>二</strike>百　二十　万
9.57,000,000　五<strike>十</strike>　千　七百万