Divisibility Test Of 3,6,9,18
A
number is said to be divisible by another number if the
remainder is 0. Divisibility rules are a set of
general rules that are often used to determine whether or not a number is
evenly divisible by another number. Divisibility Rules.
Divisibility Test of 9
A number is divisible by 9 if its digit sum is 9
Eg. 126,4347,225,549
Divisibility Test of 3 :
A number is divisible by 3 if its digit sum is 3 or 6 or 9
Eg. 444,78,567
Divisibility Test of 6: 2×3=6
A number is divisible by 6 if
1)
Number must be even
2)
Digit sum must be 3 or 6 or 9
eg. 432,43602,78
Divisibility Test of 18: 9×2=18
A number is divisible by 18 if
a)
Number must be even
b)
Digit sum must be 9
eg.
98712, 4536, 5544
Exercise:
Q1. write down any five number which
is divisible by 3,6,9 and 18 .( more than threedigit).
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