Expected learning outcomes Materials required Key words/terms Previous Knowledge Warm up Teaching the lesson Lesson plan Chapter1: Large numbers Students should be able to: • read and write numbers that have more than 8‐
digits in the Indian and International System • identify the place value of each digit in large numbers • compare large numbers and arrange them in ascending and descending order • round off numbers up to 8‐digits to the nearest ten, hundred, thousand, lakh and one, tenth, hundredth • read and write Roman numerals up to 1000 • convert Hindu‐Arabic numerals to Roman numerals and vice versa place value mats—Indian and International System, digit cards (0–9) numerals, number names, expanded form, greatest, smallest, ascending, descending, successor, predecessor, rounding off, Roman numerals
numbers up to 6 digits, place values—ones, tens, hundreds, thousands, lakhs, International Place value system As Warm Up revise the pattern in the number system and how numbers are extended. It is important that the students understand that numbers move forward in a pattern, for example, adding ‘1’ to the largest 2‐digit number gives the smallest 3‐digit number, adding ‘1’ to the largest 3‐digit number gives the smallest 4‐digit number and so on. Ensure that the students understand the system. 7‐digit , 8‐digit and 9‐digit numbers (Page 3): Introduce 7, 8 and 9‐digits numbers as given on page 3. Place and Face value (Page 4): Draw a place value table, using different coloured chalk on the board. Write different digits in different places and help the students read the numbers aloud. Explain the relationship between every two adjacent places in our place value system. Let them practice the concept by solving Check What You Know exercise 1.1. Introduce reading and writing large numbers and ask the students to do the Check What You Know exercise 1.2. Numbers in Expanded and Standard form (Page 7): Invite students to come to the front of the class and explain how numbers can be expanded and written in standard form. If they already know the method of expanding numbers, proceed to Check What You Know exercise 1.3. If not, introduce the method of expanding numbers as given on page 7. Comparing numbers(Page 8): Write any two numbers on the board and ask students to identify the bigger number. If required, give them a hint that the method of comparing remains the same whether you are comparing 2‐digit numbers or 10‐
digit numbers. If the student volunteer is able to identify the larger number, let him/her explain to the whole class how he/she found out the larger number. If not, explain the procedure using the examples given on page 8. Further explain predecessor and successor and ordering of numbers Ask the students to do the Check What You Know exercise 1.4. Rounding off numbers (Page 12): The students are already familiar with rounding off as they have done it in their previous class. Let them round off some numbers to the nearest 10, 100, 1000 and verbalise the rule. Ask them if the same rule can be extended to round off a large number to the nearest ten thousand, lakh or ten lakh. Give them some time to think and respond. Let the students sit in pairs and work out the procedure of rounding off numbers to the nearest ten thousand, lakh or ten lakh. Guide wherever required. Let students practice the learnt skill by solving Check What You Exercise 1.5.
International system of numeration (Page 13): Write a number with 7‐digits in International System on the board. Point towards the number and ask the students if any one of them can read it. Use this to introduce the International Place Value System. Refer to page 13, 14 and 15 to further explain the system. Let the students solve the practice questions given in Check What You Know exercise. 1.6. Roman numerals (Page 16): Divide the class into groups of four. Instruct them to read page 16 and 17 to understand the new number system. Give them at least one period to read and discuss. In the next period, ask questions to gauge if the students have understood the concept. Let them solve the practice questions from Check What You Know Exercise. 1.7. Discuss the use of large numbers in our day‐to‐day life. Help them understand that generally the cost of land or a house or the income of large companies is a 7‐digit number. Let the students interview some people in their neighbourhood to find the value of their land or house. Let the students look for large numbers in the newspapers such as 12 crores, 2 million etc. Ask them to cut out these numbers and then represent these numbers in the place value table. They can also write the number name, successor, predecessor, expanded form etc. The worksheet has MCQs, HOTS questions and a fun activity. It can be used to assess if the students have understood the necessary concepts and can apply the knowledge and skills gained Suggestions for follow up and further activities Practice time