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Answers
Knowing Our Numbers Class 6 Extra Questions Very Short Answer Type
Question 1.
Write the smallest three digit number whose value does not change on reversing its digits.
Solution:
The required number is 101.
Question 2.
Write the greatest three digit number which does not change on reversing its digits.
Solution:
The required number is 999.
Question 3.
What must be added to 203 to get a number whose digits are reversed of the given number?
Solution:
The number obtained by reversing the digits of 203 = 302.
∴ Difference = 302 – 203 = 99
Hence, the required number is 99.
Question 4.
Write the following in Roman numerals:
(a) 72
(b) 38
Solution:
(a) 72 = LXXII
(b) 38 – XXXVIII
Question 5.
Write 438 in its expanded form.
Solution:
438 = 4 x 100 + 3 x 10 + 8.
Question 6.
Write the greatest five-digit number using the digits 4, 2 and 0.
Solution:
The greatest five-digit number using the digits 4, 2 and 0 is 44420.
Question 7.
The capacity of a water tank is 300 litres. Express its capacity in millilitres.
Solution:
We know that
1 litre = 1000 mL
∴ 300 litres = 300 x 1000 mL = 3,00,000 mL
Hence, the capacity of water tank = 3 lakh millilitres.
Question 8.
What is the successor of greatest 6-digit number?
Solution:
Greatest 6-digit number = 999999
Successor of it = 999999 + 1 = 1000000
i. e., smallest 7-digit number.
Hence, the required successor = 10,00,000.
Question 9.
What is the place value of 7 in 1743?
Solution:
Let us write 1743 in its expanded form
1743 = 1000 + 700 + 40 +3
Place value of 7 = 700
Hence, the place value of 7 = 700.
Knowing Our Numbers Class 6 Extra Questions Short Answer Type
Question 10.
Of 7,12,540 and 71,25,400 which number is greater and by how much?
Solution:
Since 71,25,400 is a seven-digit number and 7,12,540 is a six-digit number.
So 71,25,400 is greater than 7,12,540.
Hence 71,25,400 is greater than 7,12,540 by 64,12,860.
Question 11.
Write the smallest and the greatest 5-digit numbers using the digits 0,2,4,6,8 (Repetition of digits is not allowed).
Solution:
Given digits are 0, 2, 4, 6, 8
5 – digit greatest number = 86420;
5 – digit smallest number = 20468.
Question 12.
Write the following numbers in ascending order. How many of them are even numbers?
63,854, 63,584, 65,348, 68,543, 64,835
Solution:
The given numbers are 63,854, 63,584, 65,348, 68,543 and 64,835.
Ascending order is 63,584 ; 63,854 ; 64,835 ; 65,348 ; 68,543
Even numbers are 63,584, 63,854 and 65,348.