Rahul Sofat Solutions for Chapter: Playing with Numbers, Exercise 8: REVIEW EXERCISES

Is $397$ prime orcomposite?

Which of the following pairs of numbers are co-prime?

$27$ and $36$

Which of the following pairs of numbers are co-prime?

$25$ and $64$

Write the greatest $3-$digit number and express it in terms of its prime factors.

Is the sum of any two prime numbers always even? Justify your answer with the help of examples.

The students of a class can be divided into groups of $2,3,5$ or $6$. What is the least number of children this class can have?

Using divisibility tests, determine which of the following numbers are divisible by $2, 3, 4, 5, 6, 8, 9, 10$ and $11$ (write Yes or No).

Find the smallest $6-$digit number, which is divisible by $12, 15$and $30.$