剑桥少儿英语三级下Unit5-Maths-problems.pptVIP

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 ? 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: If there were no horses, pigs and goats, how many animals would there be on the farm？ 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. Sarah’s bedroom floor is covered in triangles. Use colors to make a pattern on her floor. William’s bedroom floor is covered in squares. Use colors to make a pattern on his floor. 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 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 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+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 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 10