Question

Complete the repeated subtraction to find the square root of $225$.

• A. $9$
• B. $45$
• C. $25$
• D. $15$

Answer 1

The correct option is D $15$

$225-1=224$ ,

$224-3=221$,

$221-5=216$,

$216-7=209$,
$209-9=200$ ,

$200-11=189$

$189-13=176$ ,

$176-15=161$,

$161-17=144$,
$144-19=125$

$125-21=104$

$104-23=81$

$81-25=56$

$56-27=29$,
$29-29=0=15$

Therefore, D is the correct answer.