If one girl has 10 pieces of candy and gives 12 away how many does she have left

I am pretty sure it would be -2. Hope this helps. :)

-2 because 10-12=-2
[ [ [ [ [ [ [ [ [ [ [   10
[ [ [ [ [ [ [ [ [ [ [ [ [   12
=-2

38+105= 143, 39+104=143, and you will find then adding the numbers on opposite sides, moving inwards yields the answer 138 every time. because of this, you’re going to multiply 138 times the number of pairs, which is 34. therefore, 34*138= 4692(i’m sorry if it’s the wrong numbers, but it’s the right concept)