To find the greatest number that divides each of 150, 320 and 596 completely we will have to find the greatest common factor of these numbers ( means their HCF).
The HCF of three numbers can be found by taking any two at a time as solved below,
First, find the HCF of 150 and 320.
∴ HCF of 150 and 320 is 10. ......[2 Marks]
Now, find the HCF of 10 and 596.
∴ 2 is the HCF of 10 and 596.
Hence, HCF of 150, 320 and 596 is 2. .....[2 Marks]