Unit 3 Let’s do math! LESSON 18 课件 (共15张PPT)

课件15张PPT。UNIT 3 LET’S DO MATHLESSON 18十位数和个位数之间须用连字符“-”连接 eg. 21 twenty-one 54 fifty-four 63 sixty-three 78 seventy-eight 36 thirty-six 99 ninety-nine Again212224twenty-onetwenty-twotwenty-four252729twenty-fivetwenty-seventwenty-nineLearn and say￥11￥29I had 40 Yuan. I bought a hat and scarf. The hat was 11 Yuan. The scarf was 29 Yuan. How much money is left? 40-11=29, 29-29=0 Forty minus eleven is twenty-nine. Twenty-nine minus twenty-nine is zero. Zero Yuan is left. ￥15￥26I had 45 Yuan. I bought a hat and scarf. The hat was 15 Yuan. The scarf was 26 Yuan. How much money is left? 45-15=30, 30-26=4 Forty-five minus fifteen is thirty Thirty minus twenty-six is four. Four Yuan is left. ￥17￥36I had 60 Yuan. I bought a hat and scarf. The hat was 17 Yuan. The scarf was 36 Yuan. How much money is left? 60-17=43, 43-36=7 Sixty minus seventeen is forty-three. Forty-three minus thirty-six is seven. Seven Yuan is left. ￥21￥49I had 85 Yuan. I bought a hat and scarf. The hat was 21 Yuan. The scarf was 49 Yuan. How much money is left? 85-21=64, 64-49=15 Eighty-five minus twenty-one is sixty-four. Sixty-four minus forty-nine is fifteen. Fifteen Yuan is left. ￥16￥23I had 50 Yuan. I bought a hat and scarf. The hat was 16 Yuan. The scarf was 23 Yuan. How much money is left? 50-16=34, 34-23=11 Fifty minus sixteen is thirty-four. Thirty-four minus twenty-three is eleven. Eleven Yuan is left. Homework: 回家用英文从一数到一百， 数给爸爸妈妈听吧！