# Ex 7.2, 2 - Chapter 7 Class 8 Cubes and Cube Roots

Last updated at Aug. 1, 2018 by Teachoo

Last updated at Aug. 1, 2018 by Teachoo

Transcript

Ex 7.2, 2State true or false.(i) Cube of any odd number is even. False 3^3 = 27 7^3 = 343 Cube of odd number is always Odd. Ex 7.2, 2State true or false.(ii) A perfect cube does not end with two zeros.True 〖10〗^3 = 1000 〖20〗^3 = 8000 〖1300〗^3 = 2197000000 A perfect cube doesn’t end with 2 zeroes. Ex 7.2, 2State true or false.(iii) If square of a number ends with 5, then its cube ends with 25.False Since 〖15〗^2 = 275 〖15〗^3 = 3375 The given statement is false. Ex 7.2, 2State true or false.(iv) There is no perfect cube which ends with 8.False 2^3 = 8 〖12〗^3 = 1728 So, there are perfect cubes like 8 & 1728 that end with 8. Ex 7.2, 2State true or false.(v) The cube of a two digit number may be a three digit number.False Minimum two digits number = 10 & 〖10〗^3 = 1000 Minimum two digits number = 199 & 〖99〗^3 = 970299 So, cube of two digit number cannot be a 3 digit numbers. Ex 7.2, 2State true or false.(vi) The cube of a two digit number may have seven or more digits.False Minimum two digits number = 10 & 〖10〗^3 = 1000 Minimum two digits number = 199 & 〖99〗^3 = 970299 So, cube of two digit number cannot have seven or more digits. Ex 7.2, 2State true or false.(vii) The cube of a single digit number may be a single digit number.

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Davneet Singh

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 8 years. He provides courses for Maths and Science at Teachoo. You can check his NCERT Solutions from Class 6 to 12.