Question

8. The greatest number that exactly divides 81 and 153 is b. 10 d. 11 a. 3 c. 9​

Answer 1

Answer:

answer is 9

Applying the divisibility rule of 9 which is if the sum of the each digit in the number is divisible by 9 then the whole number is divisible by 9

first number --- 81, adding digits of 81

8 + 1 = 9

we got 9 which is divisible by 9, hence 81 is divisible by 9

second number --- 153, adding digits of 153

1 + 5 + 3 = 9

we got 9 which is divisible by 9, hence 153 is divisible by 9