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Number System Practice Worksheets: Questions & Answers for Junior

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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

  1. 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

  1. 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

  1. 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

  1. 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

  1. 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

  1. 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

  1. 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
  1. (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
  1. (c) 99,900,046
    • Indian: Ninety-nine crore ninety lakh forty-six
    • International: Ninety-nine million nine hundred thousand forty-six
  1. (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
  1. (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
  1. (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

  1. 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
  1. (b)
    Ascending Order:
    • 12,345,789
    • 21,345,689
    • 113,456,789
    • 223,456,789
  1. (c)
    Ascending Order:
    • 10,999,909
    • 19,000,919
    • 191,900,009
    • 192,000,009
  1. (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

  1. 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
  1. (b)
    Descending Order:
    • 987,654,322
    • 987,654,312
    • 98,765,311
    • 98,764,321
  1. (c)
    Descending Order:
    • 91,900,009,190,000,092
    • 909,999,901
    • 90,009,191
  1. (d)
    Descending Order:
    • 999,999,902
    • 778,899,222
    • 778,899,221
    • 9,000,000

Question 1

    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

    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

  1. 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

  1. 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

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