'''''Addition and Subtraction 1''''' teaches and tests students on addition and subtraction mathematics involving single digits, those from 0 to 9. It is an excellent resource for early mathematics students, giving them an opportunity to learn basic math skills in a fun and entertaining way that hardly feels like learning. Addition and Subtraction 1 was programmed and published by [[Thomas Hartsig]], and distributed by [[:Category:Scott Foresman|Scott Foresman]] for use on the TI-99/4A. It was released during the [[:Category:1981 Software|second quarter of 1981]] and distributed on the [[:Category:Solid State Software Command Module|Solid State Software<sup>TM</sup> Command Module]]. Addition and Subtraction 1 is also able to take advantage of the add-on [[Solid State Speech Synthesizer|Solid State Speech<sup>TM</sup> Synthesizer]] (sold separately) to enhance the educational experience of the program. Addition and Subtraction 1 originally retailed for $54.95 (USD) for the Scott Foresman version and $39.95 (USD) for the Texas Instruments version.
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