Unit 6 I have fifty markers. Lesson 21（课件+素材）北京版英语三年级上册

Unit 6 I have fifty markers. 北京版三年级上册 Lesson 21 You have so many collections. We need to learn something about addition and subtraction. Then you can collect more and more. My collections What are they talking about? Look and think Let’s watch Listen and complete It’s easy. Fifty ____ten is sixty. So the missing numbers are _______and ___________. plus Look at the numbers on the ____________: 50, 60, ____, ____, 90. Who can guess the missing numbers? blackboard seventy eighty Let’s learn Look at the numbers on the blackboard: blackboard Let’s learn So the missing numbers are seventy and eighty. 70 seventy Let’s learn Fifty plus ten is sixty. + plus Let’s learn So the missing numbers are seventy and eighty. 80 eighty Listen and complete Ninety minus ten is ______. eighty ____________minus ten is ___________. One hundred ninety Let’s learn One hundred minus ten is ninety. 100 one hundred Let’s learn One hundred minus ten is ninety. - minus Let’s learn One hundred minus ten is ninety. 90 ninety Listen and complete _________! Well done So the missing numbers are eighty and seventy. What does Lala ask? Who can guess the missing numbers? Listen and answer What are the missing numbers? Seventy and eighty. Listen and answer Listen and repeat Look at the numbers on the blackboard: 50, 60, ____, ____, 90. Who can guess the missing numbers? Listen and repeat It’s easy. Fifty plus ten is sixty. So the missing numbers are seventy and eighty. Listen and repeat One hundred minus ten is ninety. Listen and repeat Ninety minus ten is eighty. Listen and repeat So the missing numbers are eighty and seventy. Listen and repeat Well done! Let’s role-play Lala: Look at the numbers on the blackboard: 50, 60, ____, ____, 90. Who can guess the missing numbers? Baobao: It’s easy. Fifty plus ten is sixty. So the missing numbers are seventy and eighty. Let’s role-play Baobao: One hundred minus ten is ninety. Boy: Ninety minus ten is eighty. Lingling: So the missing numbers are