剑桥少儿英语三级下Unit5-Maths-problems.ppt

1、Unit 5 Maths problems,ten 十 twenty 二十 thirty 三十 forty 四十 fifty 五十 sixty 六十 seventy 七十 eighty 八十 ninety 九十 one hundred 一百,One Two Three Four Five Six Seven Eight Nine Ten,一千？,one thousand,Two add two is four Ten add twenty is thirty Thirty eight add twenty three is sixty one,add 35 is ? 28 add 58 is

2、? 39 add 45 is ?,Eight minus two is six twenty minus ten is ten Fifty eight minus twenty three is thirty five,minus 15 is ? 99 minus 54 is ? 77 minus 45 is ?,New words,food 食物,New words,radio 录音机,New words,oxygen 氧气,New words,space suits 太空服,Ask the following questions:,如果农场里没有猪/马/山羊/小鸡/鸭子，剩下的有多少只动物

3、呢？,What did Bob do last week and how much time did he spend on each time?,How many hours are there in one week? Which activity takes up most of time?,Look think and colour.,Sarahs bedroom floor is covered in triangles. Use colors to make a pattern on her floor.,Williams bedroom floor is covered in s

4、quares. Use colors to make a pattern on his floor.,A quick way to do maths,1) Large number go first,Put the large number first and count on the small one.,e.g to work out 7+496 quickly, we should change 7+496 to 497+7,Try the following numbers quickly: 6+191 2+783 6+894 5+977,A quick way to do maths

5、,2) Easy adding,To add 9, add 10, then jump back 1 To add 11, add 10, then jump on 1 more To add 19, add 20, then jump back 1,Try the followings : 42+9 68+9 84+11 67+19,A quick way to do maths,3) Make it easy,To add 24+7+3+6, look for easy pairs,e.g to work out 24+7+3+6 quickly, we should change 24+

6、7+3+6 to 24+6+3+7,Try the following numbers quickly: 77+5+15+3 38+5+2+25 48+4+2+6 87+9+3+1,Work the answers out in pairs,What must be added to 391 to make 400? What is the difference between 501 and 489?,Can you speak these in English:,368 plus 200 315 minus 100 140 take away 50 add 278 and 8 1200 m

7、inus 600 826 minus 710,Work the answers out in pairs,Can you spot the pattern of the followings?,New words and phrases,think up 想出,bring sth with sb 某人随身携带。,be ready to do sth 准备做某事,at any time 在任何时候,be good at 擅长。,work out 算出,straight away 立刻，马上,easy-going 外向的,understand 理解,New words and phrases,When it comes to 当轮到