Evaluate: 69 71 - Vidyadip

Question

Evaluate:
$69 \times 71$

✓

Answer

$=(70-1) \times(70+1)$
$= & {\left[(70)^2-(1)^2\right] }$
$= & (4900-1)$
$= & 4899$

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 "2 Mark Question" from Squares and Square Roots→Squares and Square Roots — all question types→Maths STD 8 question papers→Maharashtra Board STD 8 question papers→Maharashtra Board question paper generator→

Similar questions

A rectangular sheet of paper, 44cm × 20cm, is rolled along its length to form a cylinder. Find the total surface area of the cylinder thus generated.

Evaluate:
$(218)^2-(217)^2$

Solve:
$x^4-144 x$

Find the surface area of a cube whose edge is:
3cm

Which of the following are perfect cube?
243

Simplify the following and write as a rational number of the form $\frac{\text{p}}{\text{q}}:$
$\frac{3}{4} + \frac{5}{6} + \frac{-7}{8}$

Using laws of indices, write proper numbers in the following boxes.

$\left(\frac{5}{7}\right)^{-3}=\left(\frac{()}{()}\right)^3$

Which of the following are perfect cube?166375

Factorise:
$\text{z}^2+\text{z}+\frac{1}{4}$

Multiply:
$\left(2 x^2-1\right) \text { by }\left(4 x^3+5 x^2\right)$