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Ex 7.1, 2 (v) - Chapter 7 Class 8 Cubes and Cube Roots
Last updated at March 22, 2023 by Teachoo
Ex 7.1
Ex 7.1, 1 (i)
Ex 7.1, 1 (ii)
Ex 7.1, 1 (iii) Important
Ex 7.1, 1 (iv)
Ex 7.1, 1 (v) Important
Ex 7.1, 2 (i)
Ex 7.1, 2 (ii) Important
Ex 7.1, 2 (iii)
Ex 7.1, 2 (iv) Important
Ex 7.1, 2 (v) You are here
Ex 7.1, 3 (i) Important
Ex 7.1, 3 (ii)
Ex 7.1, 3 (iii)
Ex 7.1, 3 (iv) Important
Ex 7.1, 3 (v)
Ex 7.1, 4 Important
Transcript
Ex 7.1, 2 Find the smallest number by which each of the following numbers must be multiplied to obtain a perfect cube. (v) 100 We see that 100 = 2 × 2 × 5 × 5 Since 2 & 5 does not occur in triplets, ∴ 100 is not a perfect cube. So, we multiply by 2 × 5 to make triplet So, our number becomes 100 × 2 × 5 = 2 × 2 × 5 × 5 × 2 × 5 = 2 × 2 × 2 × 5 × 5 × 5 Now, it becomes a perfect cube. So, we multiply 100 by 2 × 5 i.e. 10 to make it a perfect cube
