Unit 3 Numbers 第二课时 Parts 3&4（讲解课件PPT）-【优翼·学练优】2023-2024学年四年级上册英语同步备课（Join in外研剑桥英语版）

Unit 3 Numbers 剑桥·四年级英语上册 第二课时 Parts 3&4 eight thirty three twelve forty seventeen Revision breakfast twenty sixty dinner ninety lunch Let’s learn 12 13 14 15 16 17 18 19 twelve thirteen fourteen fifteen sixteen seventeen eighteen nineteen 20 30 40 50 60 70 80 90 twenty thirty forty fifty sixty seventy eighty ninety 21 22 23 24 25 26 27 28 29 30 twenty-one twenty-two twenty-three twenty-four twenty-five twenty-six twenty-seven twenty-eight twenty-nine thirty 100 a(one) hundred Let’s learn. 一至十二形各异，一个一个单独记。 后面加teen变十几，thirteen，fifteen看仔细。 几十后面加ty，twenty不同重点记。 forty没有字母u，thirty，fifty更出奇。 eighteen，eighty只有一个t。 若要表达几十几，几十短横1到9。 one hundred 一百特殊记。 One, two, three, four, Five, six, seven, Eight, nine, ten, And now eleven, Twelve is two plus ten, Now let’s start again. Listen and say the rhyme. 本资源来自“课件在手，上课不愁”的www.youyi100.com优翼教学资源网 Twelve is two plus ten. 12 = 2 + 10 plus 加 Two plus ten is twelve. 12 = 2 + 10 minus 减 2 = 12－10 Two is twelve minus ten. Twelve minus ten is two. Think and say 5 + 3 = ? Five plus three is eight. 12 + 8 = ? Twelve plus eight is twenty. 25 + 9 = ? Twenty-five plus nine is thirty-four. 67 + 33 = ? Sixty-seven plus thirty-three is one hundred. Think and say 13－9 = ? Thirteen minus nine is four. 21－11 = ? Twenty-one minus eleven is ten. 36－8 = ? Thirty-six minus eight is twenty-eight. 99－61 = ? Ninety-nine minus sixty-one is thirty-eight. PAIRWORK Do the sums in English. 49+49 37+43 52+25 19+17 18+48 90-38 76-57 82-32 24-5 99-26 49+49 37+43 52+25 19+17 18+48 90-38 76-57 82-32 24-5 99-26 A: What is eighteen plus forty-eight? B: It’s sixty-six. A: What is ninety-nine minus twenty-six? B: It’s seventy-three. PAIRWORK Let’s do more practice. Thirty-seven plus forty-three is eighty. Fifty-two plus twenty-five is seventy-seven. Nineteen plus seventeen is thirty-six. Forty-nine plus forty-nine is ninety-eight. 49+49 37+43 52+25 19+17 90-38 76-57 82-32 24-5 Seventy-six minus fifty-seven is nineteen. Eighty-two minus thirty-two is fifty. Twent