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1 Knowing Our Numbers Elicit Warm-up We have learned numbers up to 7 digits in the earlier grades. Look at the numbers below. 999999 7999999 8988999 9999989 9999999 1. Write these numbers in ascending order. 2. Write the number names of the smallest and the greatest number using the Indian and International systems of numeration. 3. If you add 1 to the greatest number from above, then, how many digits will you get in the new number? How can I ﬁnd the smallest 8-digit number? Learning Objectives In this chapter, you will learn about: • Numbers up to 9 digits • Indian and International system of numeration • Comparing large numbers • Numbers in everyday life • Estimation of large numbers Roman numerals Take the greatest 7-digit number, and add 1 to it. Now, tell me, how will you ﬁnd the smallest 9-digit number. 

Chapter Review H.W. MULTIPLE CHOICE QUESTIONS 1. The predecessor of 100000 is: a. 999999 FLUENCY 1-3 4-6 99999 C. 9999 d. 9999999 2. The place value of 5 in 10506 is: a. 50 b. 5000 500 d. 5 3. The face value of 7 in 57689 is: a. 7000 b. 700 70 N 4. Find the least number of zeroes at the end of a number when it is rounded off to the nearest tens. a. 2 3 1 d. 4 5. Form a number with 6 in the tens place, 9 in the lakhs place, 3 in the ones place and 2 in the ten lakhs place. a.) 2900,063 b. 2090063 c. 2963 d. 290063 6. The place value of zero in any number is: a. 1 b. 10 c. 100 7. IXIX + a. XI = LXXI b. I 8. The sum of the predecessor of the smallest 7-digit number and 
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1 Knowing Our Numbers Elicit Warm-up We have learned numbers up to 7 digits in the earlier grades. Look at the numbers below. 999999 7999999 8988999 9999989 9999999 1. Write these numbers in ascending order. 2. Write the number names of the smallest and the greatest number using the Indian and International systems of numeration. 3. If you add 1 to the greatest number from above, then, how many digits will you get in the new number? How can I ﬁnd the smallest 8-digit number? Learning Objectives In this chapter, you will learn about: • Numbers up to 9 digits • Indian and International system of numeration • Comparing large numbers • Numbers in everyday life • Estimation of large numbers Roman numerals Take the greatest 7-digit number, and add 1 to it. Now, tell me, how will you ﬁnd the smallest 9-digit number. 

Chapter Review H.W. MULTIPLE CHOICE QUESTIONS 1. The predecessor of 100000 is: a. 999999 FLUENCY 1-3 4-6 99999 C. 9999 d. 9999999 2. The place value of 5 in 10506 is: a. 50 b. 5000 500 d. 5 3. The face value of 7 in 57689 is: a. 7000 b. 700 70 N 4. Find the least number of zeroes at the end of a number when it is rounded off to the nearest tens. a. 2 3 1 d. 4 5. Form a number with 6 in the tens place, 9 in the lakhs place, 3 in the ones place and 2 in the ten lakhs place. a.) 2900,063 b. 2090063 c. 2963 d. 290063 6. The place value of zero in any number is: a. 1 b. 10 c. 100 7. IXIX + a. XI = LXXI b. I 8. The sum of the predecessor of the smallest 7-digit number and 1 is: a. 999999 1000000 c. X C. 9999999 d. II d. 100000 9. A player has scored 867 runs in a cricket series. To ﬁnd the estimated runs he needs to score, if he wishes to complete 1000 runs, he will have to round off the numbers to the nearest: a. tens b. hundreds thousands d. none of these 10. What will be the estimated sum of 3987 and 6759 when rounded off to the nearest 1000s? Greater than the actual sum b. Smaller than the actual sum c. Equal to the actual sum d. None of these SUBJECTIVE QUESTIONS PROBLEM-SOLVING 1. Round off the following numbers to the nearest tens, hundreds and thousands. a. 535674 b. 345789 c. 900476 1-3 4-6 Add 7834567, 893600678 and 1035678. Find the sum of the greatest 8-digit and the smallest 5-digit number. A number exceeds 8945675 by 300867. What is the number? 5. Estimate the difference between 89567 and 34589 when rounded off to the nearest hundreds. 6. Write the place values of the three 7s in 789778905 and ﬁnd their sum. 7. A house was priced at &32,56,358. It went up by 20 times the next year. What is the new price of the house? Express in words. 7-11 7-10 14 

8. Varkala beach in Kerala is at a distance of 850 m from a hotel. A man travels to the spot from the hotel and returns to the hotel. How much distance does he travel in 10 days? 9. A businessman invested ? 1,20,00,000 in a marble business and after a year, got F1,20,000 as proﬁt. The following year, he invested the proﬁt in the same business. What will be his total investment in the business? 10. Vanaja and Sunantha completed a 1 km race. Vanaja completed the race in CXCVI seconds and Sunantha completed it in CLXXXII seconds. By how many seconds was Vanaja ahead of Sunantha? REASONING 11-13 14 15-16 Rahul said the face value of 5 in the number 21865734 is 5000, and Vinod said that the face value of 5 in the number is 5. Whose answer is correct? 12. Thara and Aditi were discussing the number of stars in the sky. Thara said there were 56,78,984 stars in the sky, but Aditi argued that there were more than 5 crore stars. What would be the number if you move the place value of 5 alone to 10 crore? 13. An auditorium has a capacity of 1500 seats. There are 300 seats allotted for 7500 per ticket, 400 seats for 7250 per ticket, 700 seats for 7100 per ticket, and the rest for 750 per ticket. If all the tickets are sold, how much money would be collected? 14. The population of a city is 884235. In a survey, it was reported that one out of every 15 people knows swimming. How many people know swimming in all? Amit asked his friend to make a 10-digit number. The ﬁrst 4 digits of the number are 9, 9, 8 and 6. The last 3 digits are 3, 5 and 5. The remaining digits are distinct and make the greatest possible number. What are these digits? 16. About XXXIX horses were grazing in an open ﬁeld. Later, XV more horses joined. How many horses were there altogether? ANALYSIS & CREATING 17 18-19 20-21 17. Find out the distance between any two towns in your district and convert it into metres. 18. Find the respective diameters of all the planets and try to get their pictures too. Make a chart and arrange the planets in ascending order of their radii. 19. The number of electricity connections in a state is 9,82,73, 105. Form the greatest 8-digit number by using the digits 0, 2, 3, 5, 7, 8, 9 and 1 which is greater than the given number. 20. a. Roy was asked to multiply 3,567 × 935, but he found it difﬁcult to multiply large numbers. So, he decided to round off the numbers to the nearest 100s, and then multiply them. What will be the estimated product? b. Will it be greater than or less than the actual product? 21. Japish saw a cornerstone on an old building with the inscription "Erected MCMXI". Which year was the building built? 15

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