Calculations on the Multiplication Table

Danny performed the following calculations on the multiplication table of numbers from 1 to 10:
He calculated the sum of all the numbers in the upper left square of size `9 times 9` within the multiplication table,
Added to it the sum of all the numbers in the lower right square `9 times 9`,
Subtracted from the result the sum of all the numbers in the upper right square `9 times 9`,
And then subtracted the sum of all the numbers in the lower left square `9 times 9`.
What result did he get?