The closest estimate is the exact value.39*2 = (40 - 1)*2 = 80 - 2 = 78
Then 39*22 = 39*2*11 = 78*11 = 858
[Multiplication by 11 give the digits 7, 7+8 and 8 - with the carry overs applied to the answer.]
Chat with our AI personalities
(39 x 26) + (39 x 13) = 39 x 39 = 1521
39/1
The factor pairs of 39 are 1 x 39 and 3 x 13
39.273 = 39 x 778 = 39 x 2
If that's -10x - 39, the answer is (x - 13)(x + 3) If that's +10x - 39, the answer is (x + 13)(x - 3)