How to manipulate numbers

First we need to find 3/8 of 72. To do this, convert 72 into a fraction and multiply.

To find 2 percent of 27, convert 2 percent into decimal form (0.02) and multiply it by 27.

Work backwards to solve this problem. First, find the difference between the two numbers through subtraction:

Then, multiply by to find the answer:

First, find of :

Then subtract :

Multiply by the decimal version of percent:

First, find the product of and :

Then, subtract :

Multiply by to find percent:

The square of is :

percent of is :

Multiply these to find the product:

percent of is :

percent of is :

Representing the unknown number with an , we know that . Divide both sides by to solve for :

First, find the product of and :

Next, subtract 9:

Finally, the square root of is , because .