Answer
If we write the product of two numbers in the form of (a+b)(a-b) then we can multiply them by using mental math, making it more efficient.
Work Step by Step
If we write the product of two numbers in the form of (a+b)(a-b) then we can multiply them by using mental math, making it more efficient. For example:
=$24\times16 $
= (20+4)(20-4)
= (20^{2}) - (4^{2})
= 400 - 16
= 384
