UNIT 3 LET'S DO MATH LESSON 18 课件-1

1、UNIT 3 LETS DO MATH,LESSON 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,Again,21,22,24,twenty-one,twenty-two,twenty-four,25,27,29,twenty-five,twenty-seven,twenty-nine,Learn and say,11,29,I had 40 Yuan. I bought a hat and scarf. T

2、he 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.,15,26,I 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=3

3、0, 30-26=4 Forty-five minus fifteen is thirty Thirty minus twenty-six is four. Four Yuan is left.,17,36,I 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

4、 seven. Seven Yuan is left.,21,49,I 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.,16,23,I 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-