What is the square root of 16 times 25?

Answer 1

The wording is a little ambiguous, so this could be interpreted two ways. Remember that √(a*b) = (√a)*( √b), so:

• If it is √(16*25) = (√16)*(√25) = 4*5 = 20. Note that -20 is also an answer.
• If it is (√16)*25 = (4)*25 = 100 [-100 is also an answer.]

Answer 2

The square root of 16 is 4 and the square root of 25 is 5. Therefore, the square root of 16 times 25 is equal to 4 times 5, which equals 20.