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 QUES

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