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'''''Addition and Subtraction 3''''' is an [[:Category:Educational|educational]] software title developed by [[:Category:Scott Foresman|Scott Foresman Electronic Publishing]] for the TI-99/4A home computer system which helps young children learn [[:Category:Mathematics|mathematics]]. It was released during the first quarter of 1984 and originally retailed for $22.95 (USD). It was developed and programmed by [[Thomas Hartsig]] and was sold as a [[:Category:Solid State Software Command Module|Solid State Software^TM Command Module]] cartridge. Addition and Subtraction 3 can take advantage of the optional speech synthesizer [[Solid State Speech Synthesizer|Solid State Speech^TM Synthesizer]] add-on and enhance (sold separately) which enhances the activities with human-like speech, although use of the speech synthesizer is optional.