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Earn +20 ptsQ: What is a device used for adding a subtracting numbers?
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How can you get 3 by adding or subtracting or dividing or multiplying by the numbers 3 4 2 7 Each numbers can only be used once?
3 * 4 - 2 - 7 = 12 - 2 - 7 = 10 - 7 = 3
Who invented The first Mechanical Counting Device?
The first mechanical counting device was invented by Blaise Pascal in 1642. It was primarily used as an adding machine. It could add and subtract two numbers.
How do you make numbers 1-9 equal 99 by adding and subracting them?
You can't if its just adding and subtracting. If you can multiply and divide then: 9 * 8 = 72 5 * 6 = 30 30 + 72 = 102 102 - 3 = 99 Notice I haven't used all of the numbers... I don't know whether you were supposed to...
What is the upside down birthday cake method in math?
It is a method of finding the LCM (Least Common Multiple) of 2 or more numbers. Suitably used for finding the least common denominator when adding/subtracting fractions.
What are composite numbers used for?
Well they are used for multipling dividing adding and subtraction
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