Final answer:
To find the percentage of a number, you can use the formula (Part/Whole) * 100. In this case, 9 out of 10 is equal to 90%.
Step-by-step explanation:
In order to find the percentage of one number in relation to another, you can use the following formula:
Percentage = (Part/Whole) * 100
In this case, 9 is the part and 10 is the whole. Plugging these values into the formula, we get:
Percentage = (9/10) * 100 = 90%
Therefore, 9 out of 10 is equal to 90%.
Learn more about Finding percentages