Question

(d) 2162
Do you know the divisibility
test for 42
A number is divisible by 4 if
the number formed by the last,
two digits is divisible by 4 or
the last two digits are zeros.​

Answer 1

Subtracting 2 times the last digit from the rest gives a multiple of 7. (Works because 21 is divisible by 7.)

Answer 2

Answer:

The number should be divisible by 6 and 7.

Divisibility rule of 6 = It should be divisible by 2 and 3.

Divisibility rule of 7 = To check if a number is evenly divisible by 7: Take the last digit of the number, double it Then subtract the result from the rest of the number If the resulting number is evenly divisible by 7, so is the original number.

So let's check if 2162 is divisible by 42.

Step 1 - Divisibility of 6 - Last digit is 2. it's an even number. so it is divisible                    by  

                                        2.

                                        Sum of digits- 2+1+6+2 = 11. Not divisible by 3

Hence 2162 is not divisible by 42