for gcse homework. I have dyslexia.

Question

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528

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what's 100-99+98=97+ ... + 4 - 3 + 2 - 1?

Guest Sep 27, 2015

+130516

+10

Best Answer

Notice that we can write this as the sum of 50 subtractions, thusly:

[100 - 99] + [98 - 97] + [96 - 95] +.......+ [4 - 3] + [2 -1] =

1 + 1 + 1 + .......+ 1 + 1 and we will have summed 1 fifty times....so.......

50(1) = 50

CPhill Sep 27, 2015

CPhill · Answer 1 · 2015-09-27T02:28:50

Notice that we can write this as the sum of 50 subtractions, thusly:

[100 - 99] + [98 - 97] + [96 - 95] +.......+ [4 - 3] + [2 -1] =

1 + 1 + 1 + .......+ 1 + 1 and we will have summed 1 fifty times....so.......

50(1) = 50

Guest · Answer 2 · 2015-09-27T02:25:40

I would start from the left ...each set of two numbers equals 1 2-1 4-3 etc there are 50 sets of these numbers , so 50 is the answer

Guest · Answer 3 · 2015-09-27T02:26:33

Ooops...I mean stat from the RIGHT ....I am NOT dyslexic, but I am left handed

Guest · Answer 4 · 2015-09-27T02:42:43

thanks for the help, i didnt see that aha :).