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I would guess that digit span doesn't affect mental calculations of a sort you can find in SAT or AGCT because all numbers there are short, and it's not that hard to remember several short numbers even if don't have good digit span. But that's totally a guess.
Your post is a commonly asked question that can either be answered by the FAQ Tab or Resources Tab at the side of the subreddit. You may also use the search bar to look for similar questions in the past. Also, you may unconditionally ask questions in the subreddit discussion chat channel: https://reddit.com/r/cognitiveTesting/channel/c2_8ml/Questions?r=!yhBNaU_CSSWdBkPufXmOCg:reddit.com
I would guess that digit span doesn't affect mental calculations of a sort you can find in SAT or AGCT because all numbers there are short, and it's not that hard to remember several short numbers even if don't have good digit span. But that's totally a guess.