3 and 27.
-9 and -9 multiply to get 81. ■
The sum of the first nine odd numbers is 81.
If it was a square, the answer would be 81 square cm. The area will be the product of two numbers whose sum is half the perimeter.
11 + 12 + 13 + 14 + 15 + 16 = 81
25 (25+27+29=81)
They are: 3*27 = 81 and 3+27 = 30
-9 and -9 multiply to get 81. ■
They are: 79+2 = 81
The sum of the first nine odd numbers is 81.
6,561
The only pair of positive single-digit numbers which give a product of 81 are 9 and 9.
(4 x 9) + (5 x 9) = (9 x 9)c= 81
If it was a square, the answer would be 81 square cm. The area will be the product of two numbers whose sum is half the perimeter.
40 & 41
3, 5, 7, 9, ... , 81.
11 + 12 + 13 + 14 + 15 + 16 = 81
25 (25+27+29=81)