Explain how to find the sum positive eight plus negative ten using game chips, then give the answer.
algbra - bobpursley, Thursday, September 8, 2011 at 3:13pm
consider postive chips to be red, negative to be black. Each black stacked on a red is zero.
put out the positive, then take the black chips, stacking them on the red. So you have two left over. Sum is -2, as all the zeroes don't matter.