《用美国小孩的方法学英语最有效》由会员分享，可在线阅读，更多相关《用美国小孩的方法学英语最有效（10页珍藏版）》请在金锄头文库上搜索。
1、用美国小孩的方法学英语最有效Rounding off Numbers数字的四舍五入How do you round numbers like 32 and 38 to the nearest ten?你如何把32 和38 两个数字用四舍五入取到十位数呢？(1) First see what two tens a number is between. Both 32 and 38 are between 30 and 40.(1) 首先，看看数字是介于哪两个十位数之间。32和38都介于30和40 之间。(2) Then see which ten a number is closer to. I
2、f the ones digit is less than 5, round to the lesser ten. If the one digit is 5 or greater, round to the greater ten.(2) 然后再看哪一个十位数最接近你要四舍五入的数字。如果数字低于5，则四舍五入到较小的十位数。如果数字等于或是高于5，则四舍五入到较大的十位数。 From the rule, we know 32 rounds up to 30, and 38 rounds up to 40.根据上面的规则，我们知道32四舍五入后等于30，而38则等于40 。Estimatio
3、n of Sums概算To estimate a sum, first round each number to the same place value. Then add the rounded numbers.要大致算出数字的总和，首先要把每个数字四舍五入。然后把四舍五入的数字相加。Estimate: 53 + 48 = ?概算：53 加48等于多少？Step 1: Round each number to the same place value.步骤1：把53和48四舍五入。53 5053 50+48 +50+ 48 + 50Step 2: Add.步骤2：把四舍五入后的数字相加。1
4、00100Estimate: 498 + 112 =?概算：498加112等于多少？Step 1: round each number to the same place value. Step 2: Add.步骤1：把498和112 四舍五入。步骤 2：把四舍五入后的数字相加。498 500498 500+ 112 + 100+112 + 100600600【注】在商业上，概算（estimate)是一种重要的思考方式。人们通常运用概算的方式同他人进行商务交易。因此，在小学阶段要注意概算能力的提高。Use guess and check to solve the problem用猜测和检验的方
5、法解决问题Jack and Susan work in a shoe store. Last week, Jack sold 6 more pairs of shoes than Susan did. Together they sold 30 pairs. How many pairs of shoes did each person sell?杰克和苏珊在一家鞋店工作。上个星期，杰克比苏珊多卖6双鞋。他们两个共卖30双鞋。请问两人各卖多少双？Jack _ pairs.杰克 _ 双。Susan _ pairs.苏珊 _ 双。(1) Underline what the problem ask
6、s.(1) 将问题画底线。(2) Check your answer.(2) 检验答案是否正确。(3) Complete the blank with right numbers.(3) 在空格里填上正确的数字。答 案1. How many pairs of shoes did each person sell?2. Clue 1: Jacks Shoes + Susans Shoes = 30Check: 18 + 12 = 30Clue 2: Jacks shoes Susans shoes = 6Check: 18 12 = 63.18, 12注Addition din n. 加法Sub
7、traction sbtrkn n. 减法基本的数学加减算式的念法：5+3=8 Five plus three equals eight.9-5=4 Nine minus five equals four.Problem Solving应用题John spent 10 in all on a hot dog and soda at the baseball game. The hot dog cost 6 than the soda. How much did the hot dog cost? How much did the soda cost?在棒球运动会上约翰花了10美元买了一个热狗和
8、一瓶汽水。热狗比汽水贵6美元。买热狗花了多少钱？买汽水又花了多少钱？(1)Understand the problem:(1)理解问题：What do you want to know?你想要知道什么？How much did the hot dog cost? How much did the soda cost?热狗多少钱？汽水多少钱？What information is given?题中给了哪些信息？Clue 1: hot dog + soda = 10线索1：热狗的花费+ 汽水的花费10美元Clue 2: hot dog - soda= 6线索2：热狗的花费汽水的花费6美元(2)Pl
9、an how to solve it:(2)打算如何解决问题：What method can you use?你会用什么方法？You can guess an answer for the first clue. Then you can check your guess with the second clue.针对第一个线索你可以猜测一个答案。然后你再用第二个线索检测你的猜测是否正确。(3)Solve it:(3)解决问题：How can you use this method to solve the problem?你如何用这种方法解决问题？You know that hot dog
10、costs 6 than the soda. Use 6 as your first guess. Think about what two numbers could equal to. Make a table to organize your guesses.你知道热狗的价钱比汽水贵6美元。可以把6作为你的第一个猜测，同时想想两个数字相加等于多少。列出表格来组织你的猜测。What is the answer?结果是什么？Hot dog cost 8.热狗的价钱是8美元。Soda cost 2.汽水的价钱是2美元。(4)Look back and check your answer:(4)
11、回过头来再检验你的答案：Is your answer reasonable?你的答案合理吗？Clue 1: hot dog + soda = 10线索1：热狗的价钱+ 汽水的价钱10美元Check: 8+2=10检验：8+2=10Clue 2: hot dog - soda= 6线索2：热狗的价钱汽水的价钱6美元Check: 8-2 =6检验：8-2=6The answer matches the clues. The answer is reasonable.答案和线索相符合。答案是合理的。Guess Check Evaluate猜测 检查 评估6+4= 10 6 is only 2 mor
12、e than 4. 6 is too low.6+4= 10 6只比4 多2。 6太小了。7+3=10 7 is only 4 more than 3. 7 is too low.7+3=10 7只比3多4。 7 太小了。8+2=10 8 is 6 more than 2. 8 is correct.8+2=10 8比2多6。 8是正确的。How to Decorate a T-Shirt怎样装饰 T 恤Materials:材料：1.1 white T-shirt1. 一件白色 T 恤2. 8 in. 8 in. piece of drawing paper2. 一张8英寸 x 8英寸的绘图纸
13、3. Pen or pencil3. 钢笔或者铅笔4. 2 safety pins4. 两个安全别针5. transfer paper (Note: Transfer paper comes in a roll like waxed paper, so you can share a roll with your friends.)5. 转印纸（注：转印纸是一种像蜡纸的卷纸，所以你可以和你的朋友共同用一卷转印纸）6. 3 or 4 felt-tipped pens in different colors (Note: Felt-tipped pens come with different-s
14、ize tips. Use one with a thin tip to make outlines. Use pens with wider tips to fill in large spaces.)6. 三四支不同颜色的墨水笔（注：墨水笔是笔尖大小尺寸不等的一种笔，用笔尖细的画出轮廓，用笔尖粗的画大空间部分。 ）Below are the steps you will follow.以下是你制作的步骤。1. Use a pen or pencil to draw your picture, design, or letters on the piece of drawing paper.
15、 Your drawing should be outline. Do not fill it in. If you are printing letters, make sure they are in a straight line.1. 在绘图纸上用铅笔或钢笔画出你的设计或字母图形。你要画一个轮廓，不要填充。如果要印字母，务必用直线书写字母。2. Now place your T-shirt on a hard surface. Make sure the front is smooth. Then lay a piece of transfer paper where you want your drawing to go. Make sure the piece of transfer paper is as big or bigger than the drawing paper.2. 现在把你的 T 恤放在
