一道用英文短文叙述的数学题

Nowboysandgirls,let'sbeginourclass.AsIknow,youareinterestedinsomestrangemathproblems.SotodayI'mgoingtotellyouoneofthestrangestwaystomultiplynumbersoftwoormorefigures.Matbeyoudon'tknowtheword“multiply”.Theword“multiply”means“乘,乘法的乘”inChinese.Forexample,8multipliedby2is16.Itmeans“8乘以2是16”inChinese.Doyouunderstandnow?Ofcourse,therearemanywaystomultiplynumbers.Buthereisoneofthestrangest.

Imagineyouwishtomultiply23by17.InChinese,itmeans“23乘以17”Halfof23is11.5.Writeonly11under23asyouseeonthepaper.Halfof11is5.5.Writeonly5under11.Nowthinkitover,whatnumberwillyouwriteunderContiuneuntilyouhave1.

Nowwritethenumberunder17.Butthistimeyoumustmltiplyeachnumbrtbytwotowritethenumberunderit.Forexample,youshouldwrite34under17.Asarule,whatnumberwillyouwriteunder34?Contiuneuntilyouhaveanumberonthesamelineas1.Nowdrawalinethroughanyrowthathasanevennumberontheleft.Yes,evennumbermeans“偶数”inChinese.Inourexamplethereisonlyoneevennumberontheleft.Nowpleasedrawalinethroughthelinethathasanevennumberontheleft.Nowaddtherestofthenumbersintheright-handrow.Believeitornot,youwillgettherightanswer.Whatisit?OK.Pleasewritethenumber,Imeantherightanswerintherightplace.

Nowclass,I'llgiveyouseveralminutestodiscusshowitworks.

ˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉ

‖23×17‖

‖1134‖

‖5()‖

‖()136‖

‖1272‖

‖——————‖

‖()‖

ˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉˉ

Whatisthelastnumberyoushouldwrite?

391

请复制表格填上相应数字并结束391是怎么来的!