摘要： Auction T: This is a basketball that Yao Ming used. How much is it, do you think? S1: Fifty yuan. S2: Five hundred yuan. S3: Five hundred and fifth yuan. Give the basketball to the one who bid the highest price. Ask one student to be an auctioneer. S: This is Zhou Jielun’s T-shirt. How much is it? ... Give the T-shirt to the one who bid the highest price. S: This is ... Practise “How much is / for ...... and numbers by playing the game, auction. Step V Ask and answer Write the structures “ - plus / minus- equals - What’s -plus / minus-It's ...? on the Bb. Explain them to the class. Then ask and answer with cards with numbers. For example: T: What’s three plus four? S: It’s seven. T: What’s eighty minus thirty? S: It’s fifty. Or let Ss describe with sentences: What can they see on the cards? For example: Twenty plus sixteen equals thirty-six. Forty-seven minus twenty-two equals twenty-five. Ask more Ss to practise the sentences or let them practise in pairs. Language points: “- plus / minus- equals - . 句中plus是介词“加上 .也可用and代替,equal是动词.意为“等于 .此句中也可用be动词代替.通常把算式看作一个整体.所以 equal 和be 动词都用单数形式. e.g. Five plus / and nine equals / is fourteen. Step VI Competition Show some maths exercises on the screen. Say them with “ - plus / minus- equals - . Divide the class into two groups to have a competition. The group who can say the most exercises and answers in English in one minute will win the game. Step VII Homework

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