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The word "Circles" followed by a space, and then four numbers indicates the answer to the problem. For instance, "Circles 0 2 5 8" would be "Bending". In this example, the answer would be "[l]ike a circle that bends, or is bent".

Prepare for tests and quizzes by practicing extra problems. Simply locate a topic you wish to review in the Examples section of the calculator. An example problem will appear in the calculator. (If you’re confused by the notation in the box, click the Show button. This shows the problem in the standard mathematical format.) Solve the problem on a separate sheet of paper and write down your answer. Then check your answer using the calculator – just make sure the Select Topic section matches what you’re practicing. If you got the answer correct, great! If not, you’ll want to view the steps in order to find your mistake. Sign up for Mathway (or ask your parents to sign you up) and you’ll be able to find your errors and see how to complete the problem correctly. It’s definitely worth the investment as you can use this calculator to prepare for tests for the rest of the year.

Homework Check: Our algebra calculator can help you check your homework. Simply enter your problem and click Answer to find out if you worked the problem correctly. Now, I hope you realize that if you simply put your homework problems into the calculator and copy the answer down, you’re cheating yourself in the long run because you haven’t really learned anything. In order to do well on your upcoming tests and quizzes, you need to understand where the answer came from. That way, you can find your mistakes and learn how to complete the problems correctly. That’s why we’re encouraging you to sign up for Mathway, a supportive tool which provides you with the complete steps used to solve each problem. Ask your parents about it – it’s much cheaper than tutoring and will be a good investment in your future. Just click View Steps on the answer page to sign up. (Source: solvemathproblems.org)

You could write down the answer to the first part of the calculation on paper, and enter it into the calculator again. However, it is possible that you may make an error either in writing down the number or in typing it into the calculator. A better method is to use the fact that the calculator retains the last calculated answer, which can then be inserted in the subsequent calculation using theThe calculator makes basic and advanced operations with decimals, real numbers and integers. It also shows detailed step-by-step information about calculation procedure. Solve problems with two, three or more decimals in one expression. Add, subtract and multiply decimals step-by-step. This calculator uses addition, subtraction, multiplication or division for calculations on positive or negative decimal numbers, integers, real numbers and whole numbers. This online decimals calculator will help you understand how to add, subtract, multiply or divide decimals.The calculator follows well-known rules for order of operations. The most common mnemonics for remembering this order of operations are:

For the last century or so, computers and calculators have been built from a variety of switching devices that can either be in one position or another. Just like a light-switch, they're either "on" or "off." For that reason, computers and calculators store and process numbers using what's called binary code, which uses just two symbols (0 and 1) to represent any number. So in binary code, the number 19 is written 10011, which means (1 × 16) + (0 × 8) + (0 × 4) + (1 × 2) + (1 × 1) = 19. The beauty of binary is that you can represent any decimal number with a series of switches that are either on or off—perfect for a calculator or a computer—like this: The first thing your calculator has to do is convert the decimal numbers you input to binary numbers it can work with, and it does that using a (fairly) simple circuit called a BCD (binary coded decimal) encoder. It's simpler than it sounds—and the animation below shows how it works for the numbers 1–9. There are 10 "input" keys (I've omitted zero) wired to four output lines. Each input is wired in such a way that it triggers one or more of the outputs, so the conversion process effectively happens through the pattern of the wiring. For example, key 1 triggers just the line on the right, giving us an output of 0001 in binary, while key 7 triggers three of the four lines giving us 0111 in binary (4 + 2 + 1). (Source: www.explainthatstuff.com)

Now if you put different logic gates together, you can make more complex circuits called adders. You feed into these circuits two binary numbers as their input and get out a third, binary number as your output. The number that comes out is the binary sum of the numbers you put in. So if you fed in the electrical signals 10 and 11 you would get out 101 (2 + 3 = 5). The basic ingredient of adder circuits is a pair of logic gates, working in parallel, called a half adder, which can do sums no more complex than (wait for it!) 1 + 1 = 2. One example of a half adder looks like this: For the last century or so, computers and calculators have been built from a variety of switching devices that can either be in one position or another. Just like a light-switch, they're either "on" or "off." For that reason, computers and calculators store and process numbers using what's called binary code, which uses just two symbols (0 and 1) to represent any number. So in binary code, the number 19 is written 10011, which means (1 × 16) + (0 × 8) + (0 × 4) + (1 × 2) + (1 × 1) = 19. The beauty of binary is that you can represent any decimal number with a series of switches that are either on or off—perfect for a calculator or a computer—like this:

So far we've had a very simple look at what's going on inside a calculator, but we've not actually got to the heart of how it takes two numbers and adds them to make a third one. For those of you who'd like a bit more detail, here's a slightly more technical explanation of how that happens. In short, it involves representing the decimal numbers we use in a different format called binary and comparing them with electrical circuits known as logic gates. Photo: This is what calculators looked like in the 1970s. Note the very basic 8-digit green display (it's called a vacuum fluorescent display) and the relatively small number of mathematical functions (all you could really do was +, −, ×, ÷, square roots, and percentages). What you can't see from this photo is how thick and chunky this calculator was and how big its batteries were. Modern calculators are far more advanced, much cheaper, and use a fraction as much battery power. (Source: www.explainthatstuff.com)