Delta-K,  Teaching Ideas,  Volume 31, Issue 2

Addition and Subtraction Puzzle

Journal of the Mathematics Council of the Alberta Teachers’ Association

Volume 31 Issue 2, April 1993

23

Addition and Subtraction Puzzle

K. Allen Neufeld

  1. On the grid below, 12 points are labeled with numbers. Join with a solid line pairs of points whose numbers are the first two members in each equation below. The first one has been done for you. The points labeled 38 and 8 have been joined with a solid line.