You can't.
You can make an even number if you add 1 to it (82) or subtract 1 from it (80),
but then you've changed the number, and it isn't 81 any more. There's nothing
you can do to 81 to make it an even number.
No, 81 is an odd number.
81 is an odd composite number.
It is: (8*10)+1 = 81
Odd
Without remainder, no. 6 is even and 81 is odd, therefore 6 cannot divide 81.
81 [lots] of 29 make 2349.
9 x 9 = 81 because if you count 9 times it would make up or be 81
25 + 56 = 81 81 = odd number
9x9=81. Proving that one of the factor trees for 81 is 9xp.
9 x 9 = 81 :(
Negative 9 times 9= Negative 81
9 x 9 = 81 9 squared = 81 3 squared times 3 squared = 81