【正文】
二分之一 三分之一 四分之一 四分之三 五分之二 十分之九 a/one half (one second) onethird one quarter threefourths three quarters twofifths ninetenths 1. Practice the text in groups. 2. Finish the exercise on page 69. Do the experiment what you want in groups. Read about the experiment in this a group of classmates,practice the your experiment in front of the ’t fet the following things: Firs