For the past week we have been learning how to add not subtract. The way to do that is were you have a subtracting question and change it to a adding number for example (70-24=) you would change it to (24+___=70) the blank is where you put the number you got. The way I find it out is by using a number line. Number lines are what you use if you don't know what the answer is you use a number line.