Notice that the closest perfect squares to the square root of 72 are 64 and 81. Let's express it.
![64<\sqrt[]{72}<81](https://img.qammunity.org/2023/formulas/mathematics/college/3j2tmgpkeekyf6qwg6negj60acp1wevmgv.png)
So, if we take the square root of each number, we have.
![8<\sqrt[]{72}<9](https://img.qammunity.org/2023/formulas/mathematics/college/lpqe3ejp4jy5pllu47ncmiceo8r6mq5f9v.png)
This means the square root of 72 is between 8 and 9. The image below shows a number line with the number.s