Find the product of the following.
81 by -2
The product of a positive integer and a negative integer is always a negative integer.
So we get,
=81×-2=-162
Thus, 81×-2=-162
7 by -4
Carry out the following division.
-81 by 9
-1 by -4
70 by -5
Find the square roots of the following numbers by expressing each number as the product of primes:
81