Posted by **lesly** on Monday, March 14, 2011 at 5:02pm.

Find a shortcut for computing the sum: 1+3+5+7++11+13+15+17=?? Explain your shortcut and how you could use this same shortcut to find the sum of all the odd numbers form 45 to 99.

- math -
**Reiny**, Monday, March 14, 2011 at 5:39pm
what is the sum of the 1st and last?

what is the sum of 2nd and 2nd last ?

what is the sum of 3rd and 3rd last ?

mmmmhhhh?

- math -
**Anonymous**, Monday, March 14, 2011 at 6:16pm
1+17=18

3+15=18

5+13=18

7+11=18

4*18=72

45+99=144

47+97=144

49+95=144

51+93=144

53+91=144

55+89=144

57+87=144

59+85=144

61+83=144

63+81=144

65+79=144

67+77=144

69+75=144

71+73=144

14*144=2016

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