Unit6 I have fifty markers Lesson21（课件）-2024-2025学年北京版英语三年级上册

Unit six I have fifty markers Lesson 21 Let’s sing. Let's count by tens Let’s review. 4 Who ? What ? Where ? blackboard numbers They are playing number games. missing numbers Watch How do they play this game ? Look at the numbers on the blackboard: 50,60, , ,90. Who can guess the missing numbers ? ? look at ... 看向... ? guess 猜一猜 ? Can you guess what are the missing numbers ? They are , . 70 80 Look at the numbers on the blackboard: 50,60, , ,90. Who can guess the missing numbers ? It's easy. Fifty plus ten is sixty. So the missing numbers are seventy and eighty. ? 10 50, 60, , , 90 10 70 80 10 10 Do you know the rulers ? 50 10 60 Fifty plus ten is sixty plus is/equals Fifty plus ten equals sixty √ 60 10 70 10 70 80 10 80 90 Let’s tell. 50，60，__，__，90 Fifty plus ten is sixty. 70 80 +10 +10 +10 +10 Sixty plus ten is seventy. Seventy plus ten is eighty. Eighty plus ten is ninety. Now, let’s tell. What are the missing numbers? Right. They are 70 and 80. Do you know why? …Good! Because fifty plus ten is sixty. Sixty plus ten is seventy. Seventy plus ten is eighty. Eighty plus ten is ninety. So the missing numbers are 70 and 80. Well done, boys and girls! 18 Let's read What are the missing numbers? Let’s listen What do they say? One hundred minus ten is ninety. ? 100 10 90 minus One hundred minus ten is ninety. Ninety minus ten is eighty. ? 10 90 minus 80 10 minus 80 70 100, 90, , , 60 80 70 What are the missing numbers? 10 10 10 10 One hundred minus ten is ninety. Ninety minus ten is eighty. So the missing numbers are eighty and seventy. ? Let’s read Look and learn sixty Look and learn seventy Look and learn eighty Look and learn ninety Look and learn hundred Game time: What is missing ? hundred ninety eighty seventy sixty fifty Game time: What is missing ? hundred ninety eighty seventy sixty fifty Game time: What is missing ? hundred ninety eighty seventy sixty fifty Game time: What is missing ? hundred ninety eighty seventy sixty fifty Game time: What is missing ? hundred ninety eighty seventy sixty fifty Game time: What is missing ? hundred ninety eighty seventy sixty fifty Look and learn Fifty plus ten is sixty. Sixty plus ten is seventy. + = + = Look and say plus is . + = + = + = Look and learn One hundred minus ten is ninety. Ninety minus ten is eighty. - = - = Look and say minus is . - = - = - = Read and say A plus B is 100. A minus B is 20. B is _______. A is _______, A plus B is 90. A minus B is 50. A is _______, B is _______. A plus B is 70. A minus B is 10. A is _______, B is _______. 60 40 70 20 40 30 Homework 1. 跟录音读课文，3遍 2. 英语本：书47页，6个单词（4英1中） Lavf58.29.100 Lavf58.29.100 10919.169 9090.624 Lavf58.30.100 4153.477 4414.7026 5485.7275 $$