The rules of X Problems can change, but in this lesson you put the sum of the two side numbers in the top slot and their difference in the bottom slot.
Here's an X Problem before the slots have been filled:
To get the bottom answer we subtract 5 and -8 and we get 13 because 5 - -8 = 13.
SUBTRACTING NEGATIVES IF -5 - 8 = -13 THEN WHAT DOES -5 - -8 EQUAL? SUBTRACTING A NEGATIVE IS THE SAME AS ADDING A POSITIVE -5 - -8 = 3 -5 + 8 = 3 Here's another example: 3 - - 7 = 10 3 + 7 = 10
