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1、 Welcome! A fresh start 新的开始Please learn wisely.智慧学习1.If you dont understand, please ask.不懂要问。2.Dont try to translate every word into Chinese.不用将每一个单词翻译成中文。Demands 要求1.No scrawling.不乱涂书本/作业/练习/试卷，写错了划一横。2.No delaying.不迟到，不迟交作业。April LiangHow are negative numbers used in daily life?Bank Accounts! Ban
2、k Accounts! (unfortunately!)(unfortunately!)Temperature!Temperature!Elevators!Elevators!1.1 Using negative numbers1.1 Using negative numbersThermometerRead the temperature on the thermometer as it changes.0-10-20-30102030405060oC0-10-20-30102030405060oCRead the temperature on the thermometer as it c
3、hanges.200C0-10-20-30102030405060oCRead the temperature on the thermometer as it changes.00C0-10-20-30102030405060oCRead the temperature on the thermometer as it changes.-100CWhat is the difference in temperature between the two thermometers?0-10-20-30102030405060oC0-10-20-30102030405060oC15 degrees
4、What is the difference in temperature between the two thermometers?0-10-20-30102030405060oC0-10-20-30102030405060oC30 degreesWhat is the difference in temperature between the two thermometers?0-10-20-30102030405060oC0-10-20-30102030405060oC20 degreesWhat is the difference in temperature between the
5、two thermometers?0-10-20-30102030405060oC0-10-20-30102030405060oC20 degreesWhat is the difference in temperature between the two thermometers?0-10-20-30102030405060oC0-10-20-30102030405060oC70 degreesSea level0m10m20m30m-10m-20m-30mEstimate the height above or below sea level of the following points
6、:15m5 m6 m-15 m-5 m30 mCalculate the difference in height between the following:15m5 m6 m-15 m-5 m30 mThe helicopter and the lighthouse:15mThe dolphin and the seal:10mThe boat and the fish.21m1.Give you 3 minutes to self-study worked example 1.1 on P8.2. Do the exercise 1.1 Q1-5 , you have 5 minutes
7、.Keys:1 10, 4, 0, 2, 5, 62 a Melbourne b Moscow c 7 degrees3 a 3 b 3 c 2 d 24 Minutes passed 0 1 2 3 4Temperature (C) 8 5 2 1 45 9 degrees6 17C7 a 21 00 b 9 degrees c 5 degrees d 11C8 a It is 200 metres below sea level. b 650 metres9 a 3 b 6 c 3 d 6 e 0 f 110 a 2 b 10 c 15 d 4 e 10 f 15 add /plus ad
8、dition subtract/minus subtraction multiply/times multiplication divided by division9.10 Key words:9.10 Key words:positive numbernegative numberzero 0whole number or integer above below 1234difference差 9.10 homework1.Copy the key words two times on Exercise book and memorize them,we will do the dictation tomorrow on Exercise book .抄两次重点短语，并抄两次重点短语，并会背诵，明天听写。会背诵，明天听写。2.Finish Q 1-9 on the Practice book P 7. 完成练习书的第七页全部习题。完成练习书的第七页全部习题。 Hand in tonight before night study.
