Formula:

ab / 9 = a is the quotient and a+b is the remainder.

If the value of a+b exceeds 9 then add one to the quotient

Example:

43 / 9 = 4 is the quotient and ( 4 + 3 ) = 7 is the remainder

95 / 9 = 9 is the quotient and ( 9 + 5 ) = 14 is the remainder

= 10 is the quotient and 5 is the remainder

Formula :

abc / 9 = (a) ( a + b ) is quotient and ( a + b + c ) remainder

Example:

123 / 9 = (1)( 1 + 2 ) is quotient and ( 1 + 2 + 3 ) is remainder

=13 is quotient and 6 is remainder

841 / 9 = (8)(8 + 4) is quotient and ( 8 + 4 +1 ) is remainder

=(8)(12) is quotient and (13) is remainder

=(9)(2) is quotient (13) is remainder

=93 is quotient 4 is remainder

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123/9 is 13 remainder 6, not remainder 7. Unless I am adding 1+2+3 wrong.

thank god , atleast someone in this world knows 1+2+3 well.. you are great .