Q&A for How to Do a Cool Calculator Trick

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Are there any other cool calculator tricks?

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Kevin Wang is a Math Tutor based in New York, New York. Kevin has been tutoring math for over 10 years, and specializes in K-12 math topics and standardized tests, such as SAT and ACT. Kevin has an economics background and a career in both finance and marketing analytics. His interest in tutoring goes back even longer than his career. He discovered tutoring at the start of his university career and enjoys it as a way to stay sharp with fundamental skills and remain up to date with trends in our education system. Kevin received a BS in Economics from Duke University.

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Expert Answer

You can also find the square of any number that ends in 5. First, take your number without the 5, and multiply it by one higher than that number, then add 25 to that product. For instance, when squaring 35, you would multiply 3 by 4 to get the answer 12, then add 25. The answer is 1225. This trick works because the square of any number ending in 5 will always have a 25 at the end. The rest of the digits can be found by multiplying the leading digits of the number by the number that's one higher.

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I tried the Number 7 trick, but the answer is always 1,001. Am I doing things right?

Community Answer

You and they have to go through the whole process of dividing their first repeating number by each step, like this: 123123 ÷ 11 = 11,193; then 11,193 ÷ 13 = 861; and finally 861 ÷ 123 = 7.

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How can I type "she" in a calculator?

Community Answer

345 is "she." Check out the article on How to Write Words With a Calculator for more tips.

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Question

What is the use of CE in pocket calculators?

Community Answer

CE is clear error - you use it to clear any erroneous computations, such as dividing by zero.

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Question

I want to try some tricks involving a calculator and lots of people. How can I do it?

Community Answer

Here's what you do. First, get a graphing calculator. Ask for one number from each of the people, and plug it in. Then, tell the audience that you can calculate any number they make into a whole number. Divide by Zero. Bow as the audience applauds!

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Question

How can I use a scientific calculator for a trick?

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It probably won't work very well for writing words, but will work great for math tricks or puzzles.

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How do I make a C on the calculator?

Community Answer

On a scientific calculator, use the bracket on the left. It works sometimes but not always; sometimes it doesn't make the word look right.

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