Wisdom square 智慧广场 I have 2 coats, 3 skirts, a blouse and a skirt can match arbitrarily, how many different ways to wear? 我有2件上衣、3条裙子，一件上衣和一条裙子任意搭配，有几种不同的穿法呢？ Cooperative exploration 合作探索 1. Let me do it with pictures. 1. 我用图片摆一摆 2. First, connect the yellow jacket with the three skirts respectively. Each line represents a matching method, and there are three ways.Then...... 1. 先用黄上衣与3条裙子分别连线，每种连线表示一种搭配方法，有3种；再...... 3. One skirt can be paired with two coats...... 1. 一条裙子可以分别配2件上衣...... 4.I numbered both the coat and skirt...... 1. 我把上衣和裙子都编上号...... Unit 3 Rich sea——Three digit times one digit 富饶的大海——三位数乘一位数 Lesson 1 Buy two baskets of crabs at 400 yuan each. 购买两筐蟹，每筐400元。 There are five fishing boats, each of which catches about 300 kilograms of fish. 有5条捕鱼船，每条船大约捕300千克鱼。 A total of 312 kilograms of scallops, 3 yuan per kilogram. 扇贝一共312千克，每千克3元。 What questions can you ask? 你能提出什么问题？ Cooperative exploration 合作探索 How much would it cost to buy 2 baskets of crabs? 买2筐蟹，需要多少钱？ four hundreds times two is _______(yuan) 400×2＝_________(元) Two 400's add up to 800 2个400相加得800 4 hundreds times 2 is 8 hundreds, which is 800. 4个百乘2等于8个百，是800。 four times two is eight four hundreds times two is eight hundreds 4×2＝8 400×2＝800 How much will the scallops cost altogether? 买扇贝一共需要多少元？ three hundred and twelve times three is ______(yuan) 312×3＝_______(元) What should I put in the hundreds place? Why ? 积的百位上应该写几？为什么？ Lesson 2 A total of 121. There are eight crabs in a cage. 共121笼。一笼养8只螃蟹。 Each cage contains 125 scallops. Seven cages. 每笼装125只扇贝。养了7笼。 What questions can you ask? 你能提出什么问题？ Cooperative exploration 合作探索 How many crabs in a 121 cage? 121笼装多少只螃蟹？ one hundred and twenty one times eight is ______ 121×8＝______(只) Let me do it in vertical form. 我列竖式计算。 What should I put in the hundreds place? Why ? 积的百位上应该写几？为什么？ How many scallops in 7 cages? 7笼装多少只扇贝？ one hundred and twenty five times seven is ________ 125×7＝_______(只) What do I put in the tens place and the hundreds place? 积的十位和百位上应该写几？ Think about , what do you pay attention to when you do it in vertical form? 想一想，用竖式计算时，要注意什么？ Lesson 3 On average, 102 kg is processed per hour. 平均每小时加工102千克。 On average, each workshop processes 820 kg. 平均每个车间加工820 千克。 What questions can you ask? 你能提出什么问题？ Cooperative exploration 合作探索 How many kilograms of ribbon fish can be processed in 4 hours? 1. 4小时能加工多少千克带鱼？ One hundred and two is _______(kg) 102×4＝_______(千克) What do I put in the tens place of the product? Why？ 积的十位上该写几呢？为什么？ How many kilograms of ribbon fish are processed in 2 workshops? 2.2个车间加工多少千克带鱼？ eight hundred and twenty times two is ________(kg) 820×2＝_________(千克) Let me do it in vertical form. 我列竖式计算。 Or you could write it like this. 还可以这样写。 A box of ribbon fish is 398 yuan. If I buy 7 cases, will 3000 yuan be enough? 1. 一箱带鱼398元。如果买7箱，3000元钱够吗？ three hundred and ninety eight times seven is approximately equal to _____(yuan) 398×7≈_______(元) To solve such problems, it is not necessary to calculate the exact result, can use the method of estimation. 解决这样的问题，不需要精确的计算结果，可以用估算的方法。 three hundred and ninety eight is approximately equal to four hundred. 398≈400 four hundred times seven is two thousand and eight hundred(yuan) 400×7＝2800(元) 2800 less than 3000 ,3000 yuan is enough. 2800小于3000,3000元钱够了。 |
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