Question

Find the square of $43$ without multiplication.

• A. $2401$
• B. $4801$
• C. $1842$
• D. $1849$

Answer 1

Answer: (D)

$1849$

It can be written as $43=40+3$
${43}^2=(40+3{)}^2={40}^2+2\times 40\times 3+3^2$
$=1600+2\times 120+9$
$=1849$
Therefore, D is the correct answer.