Ming made a triangular picture frame out of cardboard. The sides of the frame are 6.75 in., 6.75 in., and 8.375 in. Ming uses th
e addition below to determine the amount of string she needs to decorate the edges of the frame. mc012-1.jpg Which explains Ming’s error? She should have included the decimal in 6.75 and aligned the decimal points to add 6.750 + 6.750 + 8.375 = 21.875. She forgot to put the decimal point in two of the numbers: 0.675 + 0.675 + 8.375 = 9.725.. She added 6.75 twice, and she should have only added it once: 6.75 + 8.375 = 15.125. She should have placed a zero placeholder after the decimal point to add 6.075 + 6.075 + 8.375 = 20.525.
