4A Unit 7 It’s late
第一课时
What’s …plus …?
? + ? = ?
What’s …minus …?
? — ? = ?
twenty+ one = twenty-one
twenty-two twenty-three
twenty-four twenty-five
twenty-six twenty-seven
twenty-eight twenty-nine
forty+ one = forty-one
forty-two forty-three
forty-four forty-five
forty-six forty-seven
forty-eight forty-nine
fifty+ one = fifty-one
..