Download App

Cubes and Cube Roots — MATHS STD 8 — Question

ICSE BoardEnglish MediumSTD 8MATHSCubes and Cube Roots3 Marks
Question
Find if the following number is a perfect cube? $243$
✓

Answer

$243$
$3$ $243$
$3$ $81$
$3$ $27$
$3$ $9$
$3$ $3$
  $1$
$\because 243 = 3 \times 3 \times 3 \times 3 \times 3$
$= (3 \times 3 \times 3) \times 3 \times 3$
$= 3^3 \times 3 \times 3$
$\therefore 279$ is not a perfect cube.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "[3 marks sum]" from Cubes and Cube Roots→Cubes and Cube Roots — all question types→MATHS STD 8 question papers→ICSE Board STD 8 question papers→ICSE Board question paper generator→

Similar questions

Multiply: $2x^2 – 4x + 5 by x^2 + 3x – 7$
→
Find the product : $(a b-2)(a b+4)$
→
A number is increased from $125$ to $150$; find the percentage increase.
→
If $1125 = 3^m x 5^n,$ find $m$ and $n$
→
Express as a ratio : $26 \frac{2}{3} \%$
→
A number is increased by $10\%$ and the resulting number is again increased by $20\%$. What is the overall percentage increase in the number?
→
Is it possible to have a regular polygon whose each exterior angle is: $80^\circ$
→
In an objective type paper of $150$ questions; John got $80\%$ correct answers and Mohan got $64\%$ correct answers. $\ (i)$ How many correct answers did each get?$(ii)$ What percent is Mohan’s correct answers to John’s correct answers?
→
Solve the following equation: $\frac{x-1}{7 x-14}=\frac{x-3}{7 x-26}$
→
$m$ and $n$ are two rational number such that $m \times n =-\frac{25}{9}$ if $n =-\frac{10}{9}$, find $m$
→