Factors of 9=1, 3, 9Factors of 9 that add up to numbersFactors of 9 that add up to 13 =1 + 3 + 9Factors of 9 that add up to 4 = 1 + 3Factor of 9 in pairs1 x 9, 3 x 3, 9 x 11 and 9 are a factor pair of 9 since 1 x 9= 93 and 3 are a factor pair of 9 since 3 x 3= 99 and 1 are a factor pair of 9 since 9 x 1= 9
