Number System Practice Worksheets: Questions & Answers for Junior आधुनिक विद्या निकेतन ट्यूशन सेंटर Visit: avnlearn.com

1. Number System

Exercise 1A

Question 1

Write the number between 3456 and 3466.

Answer :

The numbers between 3456 and 3466 are 3457, 3458, 3459, 3460, 3461, 3462, 3463, 3464, 3465, and 3466.

Question 2

Write the numeral for each of the following numbers:

1. Nine thousand eighteen
2. Fifty-four thousand seventy-three
3. Three lakh two thousand five hundred six
4. Twenty lakh ten thousand eight
5. Six crore five lakh fifty-seven
6. Two crore two lakh two thousand two hundred two
7. Twelve crore twelve lakh twelve thousand twelve
8. Fifteen crore fifty lakh twenty thousand sixty-eight

Answer :

Here are the numerals for each of the given numbers:

1. Nine thousand eighteen: 9018
2. Fifty-four thousand seventy-three: 54073
3. Three lakh two thousand five hundred six: 302506
4. Twenty lakh ten thousand eight: 201008
5. Six crore five lakh fifty-seven: 650057
6. Two crore two lakh two thousand two hundred two: 2202202
7. Twelve crore twelve lakh twelve thousand twelve: 12122112
8. Fifteen crore fifty lakh twenty thousand sixty-eight: 15520608

Question 1

1. Write each of the following numbers in words:
   1. 63,005
   2. 7,07,075
   3. 34,20,019
   4. 3,05,09,012
   5. 5,10,03,604
   6. 6,18,05,008
   7. 19,09,09,900
   8. 6,15,30,807
   9. 6,60,60,060

Answer :

Here are the numbers written in words:

1. 63,005: Sixty-three thousand five
2. 7,07,075: Seven lakh seven thousand seventy-five
3. 34,20,019: Thirty-four lakh twenty thousand nineteen
4. 3,05,09,012: Three crore five lakh nine thousand twelve
5. 5,10,03,604: Five crore ten lakh three thousand six hundred four
6. 6,18,05,008: Six crore eighteen lakh five thousand eight
7. 19,09,09,900: Nineteen crore nine lakh nine thousand nine hundred
8. 6,15,30,807: Six crore fifteen lakh thirty thousand eight hundred seven
9. 6,60,60,060: Six crore sixty lakh sixty thousand sixty

Question 1

2. Write each of the following numbers in expanded form:
   1. 15,768
   2. 3,08,927
   3. 24,05,609
   4. 5,36,18,493
   5. 6,06,06,006
   6. 9,10,10,510

Answer :

Here are the numbers written in expanded form:

1. 15,768:
   ( 10,000 + 5,000 + 700 + 60 + 8 )

2. 3,08,927:
   ( 3,00,000 + 8,000 + 900 + 20 + 7 )

3. 24,05,609:
   ( 20,00,000 + 4,00,000 + 5,000 + 600 + 9 )

4. 5,36,18,493:
   ( 5,00,00,000 + 30,00,000 + 6,00,000 + 1,00,000 + 400 + 90 + 3 )

5. 6,06,06,006:
   ( 6,00,00,000 + 6,00,000 + 6 )

6. 9,10,10,510:
   ( 9,00,00,000 + 10,00,000 + 10,000 + 500 + 10 )

Question 1

3. Write the corresponding numeral for each of the following:
   1. 6 × 10000 + 2 × 1000 + 5 × 100 + 8 × 10 + 4 × 1
   2. 5 × 10000 + 8 × 1000 + 1 × 100 + 6 × 10 + 2 × 1
   3. 2 × 10000 + 5 × 1000 + 7 × 100 + 9 × 10 + 5 × 1
   4. 3 × 1000000 + 4 × 100000 + 6 × 1000 + 5 × 100

Answer :

Here are the corresponding numerals for each of the given expressions:

1. (a) ( 6 ,000 + 2 ,000 + 5 + 8 + 4 ) = 62,584

2. (b) ( 5 ,000 + 8 ,000 + 1 + 6 + 2 ) = 58,162

3. (c) ( 2 ,000 + 5 ,000 + 7 + 9 + 5 ) = 25,795

4. (d) ( 3 ,000,000 + 4 ,000 + 6 ,000 + 5 ) = 34,605,000

Question 1

4. Write the number coming just before and coming after the given number:
   1. 42678
   2. 998866
   3. 124680
   4. 87654

Answer :

Here are the numbers coming just before and just after the given numbers:

1. (a) 42678:

   • Just before: 42677
   • Just after: 42679

2. (b) 998866:

   • Just before: 998865
   • Just after: 998867

3. (c) 124680:

   • Just before: 124679
   • Just after: 124681

4. (d) 87654:

   • Just before: 87653
   • Just after: 87655

Question 1

5. Write the next three whole numbers after 30999.

Answer :

The next three whole numbers after 30,999 are:

• 31,000
• 31,001
• 31,002

Question 1

6. Write the three whole numbers occurring just before 10001.

Answer :

The three whole numbers occurring just before 10,001 are:

• 10,000
• 9,999
• 9,998

Question 1

7. How many whole numbers are there between 1032 and 1209?

Answer :

To find the number of whole numbers between 1,032 and 1,209, you subtract the smaller number from the larger number and then subtract 1:

[ 1,209 - 1,032 - 1 = 176 ]

Thus, there are 176 whole numbers between 1,032 and 1,209.

Question 1

8. Insert commas suitably and write the names according to Indian System of Numeration and International System of Numeration:
   1. 87595762
   2. 8546283
   3. 99900046
   4. 98432701
   5. 78921092
   6. 7452283

Answer :

Here are the numbers with suitable commas and their corresponding names in both the Indian and International Systems of Numeration:

1. (a) 87,595,762
   • Indian: Eight crore seventy-five lakh ninety-five thousand seven hundred sixty-two
   • International: Eighty-seven million five hundred ninety-five thousand seven hundred sixty-two

---

2. (b) 85,462,83
   • Indian: Eighty-five lakh forty-six thousand two hundred eighty-three
   • International: Eight million five hundred forty-six thousand two hundred eighty-three

---

3. (c) 99,900,046
   • Indian: Ninety-nine crore ninety lakh forty-six
   • International: Ninety-nine million nine hundred thousand forty-six

---

4. (d) 98,432,701
   • Indian: Ninety-eight crore forty-three lakh twenty-seven hundred one
   • International: Ninety-eight million four hundred thirty-two thousand seven hundred one

---

5. (e) 78,92,10,92
   • Indian: Seventy-eight crore ninety-two lakh ten thousand ninety-two
   • International: Seventy-eight million nine hundred twenty-one thousand ninety-two

---

6. (f) 74,52,283
   • Indian: Seventy-four lakh fifty-two thousand two hundred eighty-three
   • International: Seven million four hundred fifty-two thousand two hundred eighty-three

Question 1

9. Arrange the following numbers in ascending order:
   1. 878787877, 696969696, 9996655, 8790001
   2. 12345789, 21345689, 113456789, 223456789
   3. 19000919, 192000009, 191900009, 10999909
   4. 223344556, 3000000, 209999999, 222998877

Answer :

Here are the numbers arranged in ascending order for each set:

1. (a)
   Ascending Order:
   • 9,996,655
   • 8,790,001
   • 696,969,696
   • 878,787,877

---

2. (b)
   Ascending Order:
   • 12,345,789
   • 21,345,689
   • 113,456,789
   • 223,456,789

---

3. (c)
   Ascending Order:
   • 10,999,909
   • 19,000,919
   • 191,900,009
   • 192,000,009

---

4. (d)
   Ascending Order:
   • 3,000,000
   • 222,998,877
   • 223,344,556
   • 209,999,999

(Note: The correct arrangement for (d) is actually:
3,000,000
209,999,999
222,998,877
223,344,556)

Question 1

10. Arrange the following numbers in descending order:
    1. 787878787, 969696966, 55566699, 78900002
    2. 98764321, 987654312, 98765311, 987654322
    3. 91900009190000092, 90009191, 909999901
    4. 778899222, 999999902, 9000000, 778899221

Answer :

Here are the numbers arranged in descending order for each set:

1. (a)
   Descending Order:
   • 787,878,787
   • 969,696,966
   • 78,900,002
   • 55,566,699

---

2. (b)
   Descending Order:
   • 987,654,322
   • 987,654,312
   • 98,765,311
   • 98,764,321

---

3. (c)
   Descending Order:
   • 91,900,009,190,000,092
   • 909,999,901
   • 90,009,191

---

4. (d)
   Descending Order:
   • 999,999,902
   • 778,899,222
   • 778,899,221
   • 9,000,000

Question 1

11. 1. Write all the possible numbers of three digits using 2, 5 and 1.
    2. Write all the possible three-digit numbers using 3, 4 and 6.
    3. Write all the possible numbers of three digits using 8, 9 and 7.

Answer :

Question 1

12. 1. Write the greatest number of 4 digits using 1,0,9 and 2.
    2. Write the greatest five-digit number using 9, 1 , 0, 3 and 1.
    3. Write the greatest number of six digits using 8, 9, 6, 5, 0 and 4.

Answer :

Here are all the possible three-digit numbers for each set of digits:

(a) Using 2, 5, and 1

Three-digit Numbers:

• 251
• 215
• 521
• 512
• 125
• 152

---

(b) Using 3, 4, and 6

Three-digit Numbers:

• 346
• 364
• 436
• 463
• 634
• 643

---

(c) Using 8, 9, and 7

Three-digit Numbers:

• 897
• 879
• 978
• 987
• 789
• 798

Question 1

13. Write the successor of:
    1. 2540801
    2. 9999
    3. 50904
    4. 61639
    5. 687890
    6. 5386700
    7. 6475999
    8. 9999999

Answer :

Here are the successors for each of the given numbers:

1. (a) 2,540,801: 2,540,802
2. (b) 9,999: 10,000
3. (c) 50,904: 50,905
4. (d) 61,639: 61,640
5. (e) 687,890: 687,891
6. (f) 5,386,700: 5,386,701
7. (g) 6,475,999: 6,476,000
8. (h) 9,999,999: 10,000,000

Question 1

14. Write the predecessor of:
    1. 97
    2. 10000
    3. 36900
    4. 7684320
    5. 1566391
    6. 2456800
    7. 100000
    8. 1000000

Answer :

Here are the predecessors for each of the given numbers:

1. (a) 97: 96
2. (b) 10,000: 9,999
3. (c) 36,900: 36,899
4. (d) 7,684,320: 7,684,319
5. (e) 1,566,391: 1,566,390
6. (f) 2,456,800: 2,456,799
7. (g) 100,000: 99,999
8. (h) 1,000,000: 999,999