![]() Since we are asked which answer choice is closest to 7^8 – 2^6, it’s pretty obvious that the answer is 7^8, which is choice B. Thus, when we subtract 2^6 from the very large number 7^8, the answer is still very close to 7^8. We know that 7^8 is a relatively large number, and 2^6 is a relatively small number. Luckily, there is a much easier way to choose the correct answer. ![]() Solving this problem by using the online GRE calculator would be a nightmare! It would take an inordinate amount of time just to make the keystrokes on the GRE calculator in order to evaluate the question asked, let alone to evaluate the answer choices. ![]() So, as we can see, when we are asked to perform simple multiplication, simple addition, simple division, and a square root of a perfect square, we want to avoid using the calculator. Let’s look at a few instances when we should not use the calculator. So, as we can see, when we are asked to perform division with decimals, multiplication of large numbers, the square root of non-perfect squares, or large exponents, it’s a good time to use the calculator. Let’s look at some situations for which calculator use is or is not optimal, starting with when to use a calculator. One thing to keep in mind is that, although the calculator can save you time when you’re dealing with somewhat lengthy calculations, you need to ensure that you do not become reliant on it for simple calculations that you can perform using your mental math skills. Here are some shortcuts you can use from your keyboard:Īdditionally, you will want to become familiar with the PEMDAS order of operations and practice some problems, such as 6 + 5/11 + 3 versus (6 + 5)/11 + 3, noting that parentheses are sometimes necessary to obtain the correct answer. The mouse clicks needed for some computations can be replaced by computer keyboard strokes, saving you considerable time. Drag and drop the on-screen calculator to an unobtrusive region of the computer screen before using it.Īs you are learning the on-screen calculator, practice using your computer keyboard in conjunction with the on-screen calculator to speed up your operations. ![]()
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