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en.wikipedia.org/wiki/Mental_calculation

Mental calculation comprises arithmetical calculations using only the human brain, with no help ... Usually, the choice of radix determines what methods to use and also which calculations .... Furthermore, any number which is a multiple of both 5 and 2 is necessarily a ..... 1 2 3 4 5 6 7 8 9 10 | | | | | | | | | | left hand right hand.

socratic.org/questions/what-is-the-sum-of-2-5-and-2-4

Jun 28, 2016 ... 2 14 2=12. hence 25+12 is now the sum. Since the denominators ( 5 and 2 ) are different we cannot add them. We have to have a common ...

www.algebra.com/algebra/homework/NumericFractions/Numeric_Fractions.faq.question.163906.html

You can put this solution on YOUR website! given (2/5)+(2/4) multiply both equations to get equal denominators (LCD) to get (8/20)+(10/20) add numerators to ...

www.quora.com/What-is-the-sum-of-5-and-2

Definitely a daunting problem. We start by using alongside Taylor's theorem to get . To compute ... What will be the sum of 4-digit numbers formed using the digits 2,3,4,5 taken all at a time?(P&C) · What is the sum of all of the 4 digit numbers ...

www.hackmath.net/en/calculator/least-common-denominator?input=1/2+2/3+5/4

LCD(1/2, 2/3, 5/4): Lowest common denominator calculator calculate the lowest common denominator of two or more fractions, decimal ... Continue to fraction calculator, for example calculate the sum of fractions 1/2 + 2/3 + 5/4. What is LCD ?

www.numbernut.com/fractions/fraction-add.html

When you divide the numerator and denominator by 3 you get 2/3. Answer: 5/9 + 1/9 ... What about adding unlike fractions? You don't ... Write the sum of the numerators above the common denominator: 5/9 • Add the whole numbers: 2 + 4 = 6

www.mathleague.com/index.php/about-the-math-league/mathreference?id=70

Sep 15, 2008 ... What is a fraction? .... The least common multiple of 2, 3, 4, and 5 is 60. .... If the fractions have the same denominator, their sum is the sum of ...

www.visualfractions.com/Investigate/addi.pps

Notice how the sum 4/5 combines the 1 red fifth with the 3 blue fifths. Add Fractions 1. 1/5 and ... The numerals 12/8 and 1 1/2 are correct names for the sum of 5/8 and 7/8. Add Fractions 3 ... What is the sum of 1 2/3 and 2 1/5. To find the sum ...

www.wyzant.com/resources/answers/4639/the_sum_of_the_square_of_a_positive_number_and_the_square_of_5_more_than_the_number_is_157_what_is_the_number

the sum of the square of a positive number and the square of 5 more than the number is 157. what is the number? ... 2/4/2013 | Lyndsay from Boulder, CO | 7 Answers | 0 Votes ... We don't know what the number is yet so let's call it x. x2 + ...