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Represent 100 as product of prime factors

Which one of the following is a common factor of $$15$$ and $$12$$.

Write all the factors of 25 in blue circle, all the factors of 35 in green circle and all the common factors in yellow circle. Which is highest common factor?

Write all the factors of 24 and 36 and find out the common factors. Which is the highest common factor of these two numbers?

Write all the factors of 16 in circle I and all the factors of 20 in circle II. Write all the common factors in common part of both the circles. Which option shows it correctly?

Write all the factors of 40 in blue circle and all the factors of 60 in green circle.
1) What are the factors written in common part of both the circles?
2) Which is biggest common factor of 40 and 60? 

Write all the factors of 5, 8 and 10. Find out all the common factors of these numbers. Which is highest common factor? 

Using multiplication chart, find all the factors of $$36$$.

If Meena is having 28 bangles and she wants to make groups of bangles such that no any bangle is left, then how many bangles can she put in each group? Write all the possibilities.

Write first 10 multiples of 12 and 16. Find out all the common multiples. Which is smallest common multiple of 12 and 16?