Question

Find 85^2 using mental math. a. 5,625 b. 7,225 c. 6,825 d. 6,400

Answer 1

B bro 7,225. 85x85 should do the trick:)

Answer 2

7,225

Explanation:

find 85^2 using mental math

`85^2 = 85 * 85`

85 can be written as 80 +5

`(80+5)(80+5)`

Multiply each term inside the parenthesis

Multiply 80 with 80 +5 and then we multiply 5 with 80 +5

It becomes

`6400 + 400+400+ 25`

Now we add all the numbers

7,225