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Next, we use the same app in the number line mode. Students must first set the starting point (the first number in the problem) by tapping the + or - sign to move right or left. Once it is set, it turns yellow. Then they use the + sign to move to the right if the second number is positive, or the - sign to move to the left if the second number is negative. After we are done with this portion of the app, I explain to them that they can use the number lines on their desks to do the same thing (or draw their own number line if there isn't one available). Most students preferred the number line method to the chips, but now at least they have 2 strategies to use for integer addition.