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| Knowing your numbers |
(1) Digit: To represent any number in mathemetics, we use ten symbols 0,1,2,3,4,5,6, 7,8,9. These ten symbols are called digits.
(2) Numeral: A group of digits denoting a number is called a numeral.
(2) Numeral: A group of digits denoting a number is called a numeral.
Following are examples of Numerals-
a. 59
b. 111
c. 1,007
(3) Natural numbers - These are all the numbers from 1 onwards {1,2,3,4.....}. Natural Numbers are also called as counting numbers.
(4) Whole numbers - These are all the numbers from 0 onwards {0,1,2,3,4....}. So whole numbers include all natural numbers and zero
(5) The smallest natural number is 1 and smallest whole number is O.
(6) The successor of a whole number is 1 more than the whole number. For example, successor of 3 is 4. (3+1). Similarly, successor of 12 is 13 (12+1)
(7) The predecessor of a whole number is 1 less than the whole number. For example, predecessor of 7 is 6 (7-1). Similarly, predecessor of 19 is 18 (19-1).
a. 59
b. 111
c. 1,007
(3) Natural numbers - These are all the numbers from 1 onwards {1,2,3,4.....}. Natural Numbers are also called as counting numbers.
(4) Whole numbers - These are all the numbers from 0 onwards {0,1,2,3,4....}. So whole numbers include all natural numbers and zero
(5) The smallest natural number is 1 and smallest whole number is O.
(6) The successor of a whole number is 1 more than the whole number. For example, successor of 3 is 4. (3+1). Similarly, successor of 12 is 13 (12+1)
(7) The predecessor of a whole number is 1 less than the whole number. For example, predecessor of 7 is 6 (7-1). Similarly, predecessor of 19 is 18 (19-1).
(8) 1 does not have any predecessor in natural numbers because it is the first natural number. Similarly, zero does not have any predecessor in whole numbers as zero is the first whole number
(9) There are two systems of numeration:
(i) Indian system of numeration
(ii) International system of numeration
(10) The period in the Indian system of numeration are hundreds, thousands, crores and arab.
(11) The period of the International system of numeration are hundreds, thousands, millions, billions and trillions.
(9) There are two systems of numeration:
(i) Indian system of numeration
(ii) International system of numeration
(10) The period in the Indian system of numeration are hundreds, thousands, crores and arab.
(11) The period of the International system of numeration are hundreds, thousands, millions, billions and trillions.
Q1 Fill in the blanks:
(a) 1 lakh = _______________ ten thousand
(b) 1 million = _______________ hundred thousand
(c) 1 crore = _______________ ten lakh
(d) 1 crore = _______________ million
(e) 1 million= _______________ lakh
Ans.
(a) 10
Explaination-
1 lakh
= 100000
= 10 x 10000
= 10 × ten thousands
1 lakh
= 100000
= 10 x 10000
= 10 × ten thousands
(b) 10
Explaination-
1 million
= 1000000
= 10 x 100000
= 10 x hundred thousand
1 million
= 1000000
= 10 x 100000
= 10 x hundred thousand
(c) 10
Explaination-
1 crore
= 10000000
= 10 x 100000
= 10 x ten lakh
1 crore
= 10000000
= 10 x 100000
= 10 x ten lakh
(d) 10
Explaination-
1 crore
= 10000000
= 10 x 100000
= 10 x million
1 crore
= 10000000
= 10 x 100000
= 10 x million
(e) 10
Explaination-
1 million
= 1000000
= 10 x 100000
= 10 x one lakh
1 million
= 1000000
= 10 x 100000
= 10 x one lakh
Q2 Place commas correctly and write the numerals:
(a) Seventy three lakh seventy five thousand three hundred seven.
(b) Nine crore five lakh forty one.
(c) Seven crore fifty two lakh twenty one thousand three hundred two.
(d) Fifty eight million four hundred twenty-three thousand two hundred two.
(e) Twenty three lakh thirty thousand ten.
Ans.
(a) 73,75,307
(b) 9,05,00,041
(c) 7,52,21,302
(d) 58,423,202
(e) 23,30,010
Q3 Insert commas suitable and write the names according to Indian system of numeration -
(a) 87595762
(b) 8546283
(c) 99900046
(d) 98432701
Ans.
(a) 8,75,95,762
Eight crore seventy-five lakh ninety-five thousand seven hundred sixty-two.
(b) 85,46,283
Eight-five lakh forty-six thousand two hundred eighty-three.
(c) 9,99,00,046
Nine crore ninety-nine lakh forty-six.
(d) 9,84,32,701
Nine crore eighty-four lakh thirty-two thousand seven hundred one.
Q4. Insert commas suitable and write the names according to International system of numeration-
(a) 78921092
(b) 7452283
(c) 99985102
(d) 48049831
Ans.
(a) 78,921,092
Seventy-eight million nine hundred twenty-one thousand ninety-two
(b) 7,452,483
Seven million four hundred fifty-two thousand two hundred eighty-three
(c) 99,985,102
Ninety-nine million nine hundred eighty-five thousand one hundred two
(d) 48,049,831
Forty-eight million forty-nine thousand eight hundred thirty-one
Related Posts -
Knowing your numbers Ex 1.2
Related Posts -
Knowing your numbers Ex 1.2
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