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Using Complements

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How far from 100 are these numbers?

59    98     84    21    79
 
The answers are 41 , 2, 16, 79, 21 respectively. Each pair of numbers that add to 100, the first digits (on the left) add to 9 and the last digits (on the right) add to 10. Complement of 43 is 57, 32 is the complement of 68, and so on.

Find the complement of 84

Subtract digits from 9 except the ones digit (4) which should be subtract from 10.

Complement of 84 is

(9 -8)  (10 -4)

1          6

Complement of 84 = 100 - 84  = 16

Find the complement of 38

Complement of 38 is

(9 -3)  (10 -8)

6         2

Complement of 38 = 100 - 38  = 62

Find the complement of 684

Complement of 684

(9 - 6)   (9 - 8)  (10 - 4)

    3          1            6

Complement of 684 = 1000 - 684  = 316

Find the Complement of the following numbers

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