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* two chances to answer each exercise correctly before the computer supplies the correct answer
* durable hardware and software components with useful keyboard functions programmed into the module
===Getting Started===
1. Turn switched on.
2. Insert module.
3. Wait for the screen to appear.
4. If you do not see the Texas Instruments title scree, check to see if:
* the computer keyboard and monitor are plugged in.
* the cable connecting the keyboard and monitor is properly connected.
* both the computer and monitor are turned on.
* the module is properly inserted.
Press any key. The Scott, Foresman copyright screen and the '''Addition and Subtraction 3''' title screen are displayed. Next you will see the main selection list of activities:
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