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To Find The Difference Between Two Numbers The Greatest Of Which Is


Take as many nines as there are figures in the smallest number, and

subtract that sum from the number of nines. Let another person add

that difference to the largest number, and, taking away the first

figure of the amount, add it to the last figure, and that sum will be

the difference of the two numbers.

For example: Robert, who is 22, tells George, who is older, that he

can discover the difference of their ages; he therefore privately

deducts 22 from 99, and the difference, which is 77, he tells George

to add to his age, and to take away the first figure from the amount,

and add it to the last figure, and that last sum will be the

difference of their ages. Thus, the difference between

Robert's age and 99, is 77

To which George adding his age 35


The sum will be 112





Then by taking away the first figure, 1, }

and adding it to the last figure, 2, } 13

the sum is }

Which added to Robert's age 22


Gives George's age, which is 35