because 279 divided by 9 is 31. Try it, multiply 31 by 9.
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Yes 279/10 = 27.9
99882
9 with 9 remaining 279 - 9 = 270 = 30 x 9
The factors of 279 are: 1 3 9 31 93 279These pairs of numbers, when multiplied, equal 279:(1, 279)(3, 93)(9, 31)
81: 8 + 1 = 9 which is divisible by 9, so 81 is divisible by 9 162: 1 + 6 + 2 = 9 which is divisible by 9, so 162 is divisible by 9 199: 1 + 9 + 9 = 19 → 1 + 9 = 10 → 1 + 0 = 1 which is not divisible by 9, so 199 is not divisible by 9. 1125: 1 + 1 + 2 + 5 = 9 which is divisible by 9, so 1125 is divisible by 9. So 199 is the only one not divisible by 9.