Question

check weather the number is divisible by 9 or not:
a) 845
b) 45689
c) 981
d) 1026

Answer 1

To check whether a number is divisible by 9 or not we add up all the digits of the number and see whether the result is divisible by 9 ( same property as divisible by 3).
a) 845 (8+4+5=17)which is not divisible by 9
b) 45689 (4+5+6+8+9=31)which is not divisible by 9
c) 981 (9+8+1=18)which is divisible by 9 (Quotient = 109)
d) 1026(1+0+2+6=9)which is divisible by 9 (Quotient =  114)

Answer 2

check by adding the digits of the number and seeing if the sum is divisible b y  9

a)  sum = 17  NOT divisble
b    32  NOT divisible
c    18    YES  divisible
d      9    YES dvisible