Question 1 - Examples - Chapter 6 Class 8 Cubes and Cube Roots

Transcript

Question 1 Find the cube root of 17576 through estimation. Step 1: Make group of 3 digit, starting from right Step 2: The unit digit of cube root will be Unit digit of cube root of 17576 = Unit digit of cube root of 576 Since 576 ends with 6, it’s cube root will end in 6. (As 63 = 216, 163 = 4096) ∴ Unit digit of cube root = 6 Step 3: Now, for second group. 17 We note that 23 = 8 & 33 = 27 So, 8 < 17 < 27 23 < 17 < 33 ∴ We take smaller number So, 2 We put 2 in ten’s place of cube root. ∴ Cube root of 17576 = 26