Question

write the conditions to be fulfilled for divisibility of a number by a) 3 and 9 b) 5 and 10

Answer 1

a option is the correct answer

Answer 2

(a) 3- add all the digits of a number of it is divisible by 3 then it is divisible like 234 2+3+4 = 9 9 is divisible by 3 so 234 is also divisible

9- add all the digits of a number of it is divisible by 9 then it is divisible like 567 5+6+7 = 18 is divisible by 9 so 567 is also divisible

(b) 5 - if the number has last digit 5 and 0 then it is divisible by 5 like 190 has 0 in the last and 295 has 5 in the last so both are divisible by 5

10 - if the number has last digit 0 then it is divisible by 10 like 190 has 0 in the last so it is divisible by 10