79
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well 20 x 90 = 180, 20 x 9 = 18 add them together and you get 198
99 add 20p = 119
Factors of 55 are: 1, 5, 11, and 55 Factors of 99 are: 1, 3, 9, 11, 33, and 99 "Common" factors are numbers that are factors of both. Common factors of 55 and 99 are: 1 and 11 .
99 plus 99 equal 198.In a nother form (This is in when it is used in math class ECT.)99+99=198.
A number whose proper factors add up to less than the number is called deficient. 99 is a deficient number because the sum of its proper factors (1, 3, 9, 11, and 33) is 57.