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Find the sum of all the even numbers from 12 through 58? - Answers

840 There are a several ways to approach this problem, the most staightforward being to to simply add all of them up. Another is to let X be the sum of all of the even numbers from 12 through 58. X=12+14+16+...+54+56+58 But X also can be expressed as follows: X=58+56+54+...+16+14+12 If you add these two equations term by term, you'll notice that each term sums to 70 (12+58, 14+56, 16+54, etc.). You should also note that there are 24 70's when you add them up (i.e., there are 24 even numbers from 12 through 58. Adding the two equations above, you get: 2X=70+70+70+...+70+70+70=70*24 Dividing both side by two, you get your result: X=70*24/2 = 840.



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Find the sum of all the even numbers from 12 through 58? - Answers

https://math.answers.com/math-and-arithmetic/Find_the_sum_of_all_the_even_numbers_from_12_through_58

840 There are a several ways to approach this problem, the most staightforward being to to simply add all of them up. Another is to let X be the sum of all of the even numbers from 12 through 58. X=12+14+16+...+54+56+58 But X also can be expressed as follows: X=58+56+54+...+16+14+12 If you add these two equations term by term, you'll notice that each term sums to 70 (12+58, 14+56, 16+54, etc.). You should also note that there are 24 70's when you add them up (i.e., there are 24 even numbers from 12 through 58. Adding the two equations above, you get: 2X=70+70+70+...+70+70+70=70*24 Dividing both side by two, you get your result: X=70*24/2 = 840.



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https://math.answers.com/math-and-arithmetic/Find_the_sum_of_all_the_even_numbers_from_12_through_58

Find the sum of all the even numbers from 12 through 58? - Answers

840 There are a several ways to approach this problem, the most staightforward being to to simply add all of them up. Another is to let X be the sum of all of the even numbers from 12 through 58. X=12+14+16+...+54+56+58 But X also can be expressed as follows: X=58+56+54+...+16+14+12 If you add these two equations term by term, you'll notice that each term sums to 70 (12+58, 14+56, 16+54, etc.). You should also note that there are 24 70's when you add them up (i.e., there are 24 even numbers from 12 through 58. Adding the two equations above, you get: 2X=70+70+70+...+70+70+70=70*24 Dividing both side by two, you get your result: X=70*24/2 = 840.

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      840 There are a several ways to approach this problem, the most staightforward being to to simply add all of them up. Another is to let X be the sum of all of the even numbers from 12 through 58. X=12+14+16+...+54+56+58 But X also can be expressed as follows: X=58+56+54+...+16+14+12 If you add these two equations term by term, you'll notice that each term sums to 70 (12+58, 14+56, 16+54, etc.). You should also note that there are 24 70's when you add them up (i.e., there are 24 even numbers from 12 through 58. Adding the two equations above, you get: 2X=70+70+70+...+70+70+70=70*24 Dividing both side by two, you get your result: X=70*24/2 = 840.

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