Question

Exercise 1.4
Without actual division, using divisibility rules, classify the
following numbers as divisible by 3,4,5, 11.
a.803 07​

Answer 1

Due to divisibility rule of 3

We will find the digit sum=8+3+7=18

1+8 =9 which is divisible by 3

Rule of 4

It is odd so it is not divisible

Rule of 5

It does not have 5 at last so it is not divisible by 5

Then we will add8+3+7=18-0+0=18 that is not divisible by 11