EXERCISE-1A
Question 1
Q.1. Write the numeral for each of the following numbers:
(i) Nine thousand eighteen.
(ii) Fifty four thousand seventy-three.
(iii) Three lakh two thousand five hundred six.
(iv) Twenty lakh ten thousand eight.
(v) Six crore five lakh fifty-seven.
(vi) Two crore two lakh two thousand two hundred two.
(vii) Twelve crore twelve lakh twelve thousand twelve.
(viii) Fifteen crore fifty lakh twenty thousand sixty-eight.
Ans. (i) Nine thousand eighteen $=9,018$.
(ii) Fifty four thousand seventy three $=54,073$
(iii) Three lakh two thousand five hundred six $=3,02,506$.
(iv) Twenty lakh ten thousand eight $=20,10,008$.
(v) Six crore five lakh fifty-seven $=6,05,00,057$.
(vi) Two crore two lakh two thousand two hundred two $=2,02,02,202$.
(vii) Twelve crore twelve lakh twelve thousand twelve $=12,12,12,012$.
(viii) Fifteen crore fifty lakh twenty thousand sixty-eight $=15,50,20,068$.
Question 2
(i) 63,005
(ii) $7,07,075$
(iii) $34,20,019$
(iv) $3,05,09,012$
(v) $5,10,03,604$
(vi) $6,18,05,008$
(vii) $19,09,09,900$
(viii) $6,15,30,807$
(ix) $6,60,60,060$
Ans. (i) 63,005 = Sixty three thousand five.
(ii) $7,07,075=$ Seven lakh, seven thousand seventy five.
(iii) $34,20,019=$ Thirty-four lakh twenty thousand nineteen.
(iv) 3,05,09,012 = Three crore, five lakh, nine thousand twelve.
(v) 5,10,03,604 = Five crore ten lakh three thousand six hundred four.
(vi) $6,18,05,008=$ Six crore eighteen lakh five thousand eight.
(vii) $19,09,09,900=$ Nineteen crore nine lakh, nine thousand nine hundred.
(viii) $6,15,30,807=$ Six crore fifteen lakh, thirty thousand eight hundred seven.
(ix) 6,60,60,060 = Six crore sixty lakh sixty thousand sixty.
Question 3
Q.3. Write each of the following numbers in the expanded form:
(i) 15,768
(ii) $3,08,927$
(iii) $24,05,609$
(iv) $5,36,18,493$
(v) $6,06,06,006$
(vi) $9,10,10,510$
Ans.
(i) $15,768=(1 \times 10000)+(5 \times 1000)+(7 \times 100)+(6 \times 10)+(8 \times 1)$
(ii) $3,08,927=(3 \times 100000)+(8 \times 1000)+(9 \times 100)+(2 \times 10)+(7 \times 1)$
(iii) $24,05,609=(2 \times 1000000)+(4 \times 100000)+(5 \times 1000)+(6 \times 100)+(9 \times 1)$
(iv) $5,36,18,493=(5 \times 10000000)+(3 \times 1000000)+(6 \times 100000)+(1 \times 10000)+(8 \times 1000)+(4 \times 100)+$ $(9 \times 10)+(3 \times 1)$
(v) $6,06,06,006=(6 \times 10000000)+(6 \times 100000)+(6 \times 1000)+(6 \times 1)$
(vi) $9,10,10,510=(9 \times 10000000)+(1 \times 1000000)+(1 \times 10000)+(5 \times 100)+(1 \times 10)$
Question 4
Q.4. Write the corresponding numeral for each of the following:
(i) $6 \times 10000+2 \times 1000+5 \times 100+8 \times 10+4 \times 1$
(ii) $5 \times 100000+8 \times 10000+1 \times 1000+6 \times 100+2 \times 10+3 \times 1$
(iii) $2 \times 10000000+5 \times 100000+7 \times 1000+9 \times 100+5 \times 1$
(iv) $3 \times 1000000+4 \times 100000+6 \times 1000+5 \times 100+7 \times 1$.
Ans. (i) $6 \times 10000+2 \times 1000+5 \times 100+8 \times 10+4 \times 1=60000+2000+500+80+4$ $=62,584$.
(ii) $5 \times 100000+8 \times 10000+1 \times 1000+6 \times 100+2 \times 10+3 \times 1=500000+80000+1000+600+20+3$ $=5,81,623$
(iii) $2 \times 10000000+5 \times 100000+7 \times 1000+9 \times 100+5 \times 1=20000000+500000+7000+900+5=$ $2,05,07,905$
(iv) $3 \times 1000000+4 \times 100000+6 \times 1000+5 \times 100+7 \times 1=3000000+400000+6000+500+7=$ $34,06,507$
Question 5
Q. 5. Find the difference between the place values of the two nines in 79520986.
Ans. In 79520986
Value of first $9=9000000$ and value of second $9=900$
$\therefore$ Difference $=9000000-900=89,99,100$
Question 6
Ans.
In 27650934 place value of $7=7000000$ and face value of $7=7$
$\therefore$ Difference $=7000000-7=6999993$
Question 7
Ans. There are 900000 6-digits numbers in all i.e. $999999-99999=900000$
Question 8
Q. 8. How many 7-digit numbers are there in all?
Ans. There are 9999999 - 999999
$=90000007$-digits numbers in all.
Question 9
Ans. In 1,00,000, there are 100 thousands.
Question 10
Ans. In 10000,000, there are 10000 thousands.
Question 11
Ans. Given Number $=738$
Reversing its digits $=837$
Difference between 738 and $837=837-738=99$
Question 12
Ans. Numbers after $9547999=9547999+1=9548000$
Question 13
Ans. Number first before $9900000=9900000-1=9899999$
Question 14
Ans. Number first before $10000000=10000000-1=9999999$
Question 15
Ans. 3-digits numbers using 2,3,4 taking each digit only once will be
$234,243,324,342,423,432$
Question 16
Ans. The smallest number by using different digits 3, 1, 0, 5 and 7 will be $=10357$
Question 17
Q. 17. Write the largest number of different digits formed by using the digits $2,4,0,3,6$ and 9 .
Sol. The largest number formed by using different digits $2,4,0,3,6$ and 9 will be $=964320$.
Question 18
(i) 735821
(ii) 6057894
(iii) 56943821
(iv) 37502093
(v) 89350064
(vi) 90703006
Ans.
(i) Seven hundred thirty five thousand eight hundred twenty-one.
(ii) Six million fifty seven thousand eight hundred ninety-four.
(iii) Fifty-six million nine hundred forty-three thousand eight hundred twenty-one.
(iv) Thirty-seven million five hundred two thousand ninety-three.
(v) Eighty-nine million three hundred fifty thousand sixty-four.
(vi) Ninety million seven hundred three thousand and six.
(ii) Six million fifty seven thousand eight hundred ninety-four.
(iii) Fifty-six million nine hundred forty-three thousand eight hundred twenty-one.
(iv) Thirty-seven million five hundred two thousand ninety-three.
(v) Eighty-nine million three hundred fifty thousand sixty-four.
(vi) Ninety million seven hundred three thousand and six.
Question 19
Q.19. Write each of the following in figures in the international place-value chart:
(i) Thirty million one hundred five thousand sixty-three.
(ii) Fifty-two million two hundred five thousand six.
(iii) Five million five thousand five.
Ans.
<TABLE TO BE ADDED>
Question 20
Tick ( $\sqrt{ }$ ) the correct answer in each of the following :
Q.20. The place value of 6 in the numeral 98612453 is
(a) 6
(b) 612453
(c) 600000
(d) 986
Ans.
(c) Because 6 is at lakh place.
Question 21
(a) 4
(b) 43650
(c) 40000
(d) none of these
Ans.
(a) Because face value is always same.
Question 22
(a) 53416
(b) 49995
(c) 4995
(d) none of these
(b) Because place value and face value of 5 in 87653421 are 50000 and 5.
$\therefore$ difference $=50000-5=49995$.
Question 23
(a) 0
(b) 1
(c) 10
(d) none of these
Ans.
(b) Smallest counting number or natural number is 1.
Question 24
(a) 8999
(b) 9000
(c) 8000
(d) none of these
Ans.
(b) Number of 4-digits numbers $=9999-999$ (i.e. these are 1000 to 9999 ) $=9000$
Question 25
(a) 8999999
(b) 9000000
(c) 1000000
(d) none of these
Ans.
(b) Number of 7-digit numbers (from 1000000 to 9999999 ) $=9999999-999999=9000000$
Question 26
(a) 99999999
(b) 89999999
(c) 90000000
(d) none of these
Ans.
(c) Numbers of 8-digit numbers (from 10000000 to 99999999 )
$=99999999-9999999=90000000$
Question 27
Q. 27. What comes just before 1000000 ?
(a) 99999
(b) 999999
(c) 9999999
(d) none of these
Ans.
(b) Because $1000000-1=999999$
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