Divisibility by 3 :- Add all the digits and the sum must be divisible by 3. Ex 734193 - 7+3+4+1+9+3 =27 (27÷3=9) 547694 - 5+4+7+6+9+4=35 (35 is not divisible by 3) Divisibility by 9 :- Add all the digits and the sum must be divisible by 9. Ex 7644312 - 7+6+4+4+3+1+2=27 (27 ÷9 =3) 374114 - 3+7+4+1+1+4=20 (20 is not divisible by 9) Important:- It a number is divisible by 9 it must divisible by 3 It the last two digits of a number in Divisibility by 4:- divisible by 4 then whole number is divisible by 4. Ex 5476924 24÷4=6 so 5476924 in divisible by 4 976431 31 is not divisible by 4. Divisible by 8:- If the last three digits are divisible by 8 then whole number indivisible by 8. Ex. 7643328 328 ÷8=41 7643328 is divisible by 8 9276411 411 is not divisible by 8. Important:- If a number is divisible by 8 then its number also divisible by 4.
Divisibility by 3 :- Add all the digits and the sum must be divisible by 3. Ex 734193 - 7+3+4+1+9+3 =27 (27÷3=9) 547694 - 5+4+7+6+9+4=35 (35 is not divisible by 3) Divisibility by 9 :- Add all the digits and the sum must be divisible by 9. Ex 7644312 - 7+6+4+4+3+1+2=27 (27 ÷9 =3) 374114 - 3+7+4+1+1+4=20 (20 is not divisible by 9) Important:- It a number is divisible by 9 it must divisible by 3 Divisibility by 4:- It the last two digits of a number in divisible by 4 then whole number is divisible by 4. Ex 5476924 24÷4=6 so 5476924 in divisible by 4 976431 31 is not divisible by 4. Divisible by 8:- If the last three digits are divisible by 8 then whole number indivisible by 8. Ex. 7643328 328 ÷8=41 7643328 is divisible by 8 9276411 411 is not divisible by 8. Important:- If a number is divisible by 8 then its number also divisible by 4.