Question

find the square of 85 without actual multiplication

Answer 1

Answer:

(80+5)²

(80)²+(5)²+2×80×5

6400+25+800

7225

Answer 2

Answer:

there is a trick of square of no. which end at 5 like 25,35,45,55.... etc.

the trick is

we multiply the first no. with its consecutive no. and then paste 25 after it.

for example,

(25)² =625

2×3=6 and 25 so, 625

now, (85)²=7225

bcoz 8×9=72 and paste 25 so, 7225 answer

Step-by-step explanation: