What is 21 x 21 + 100 x 100 / 50 - 20=?

To simplify this expression, use the order of operations to solve (Parentheses, Exponents, Multiplication and Division, Addition and Subtraction).

To start, since there are no exponents or parentheses, you do multiplication and division, starting from left to right since the two operations are on the same level. When you do this, you first multiply 21*21 which would get you to this:

441+100*100/50-20

Then, multiply 100*100 to get:

441+10000/50-20

Then, divide 10000/50:

441+200-20

Then, do 441+200 since addition and subtraction comes next:

641-20

And finally, subtract to get that your final answer is 621.

621 is the answer to your question.