Right it's not as if you can unlearn to read. In fact, while I can look at Hebrew letters and see the shapes, I can't look at Latin letters and not read them, I can't trick my eyes to doing it.
Tablespoons and teaspoons you'd know by size. Ditto cups (for flour). Once you memorized whatever the amount of leavening you'd need for a batch, you've memorized it. I haven't bothered, but it wouldn't be hard. Muffins and scones I believe. It's not as if they're making puff pastry every day.
And after all, women baked and cooked for centuries without reading, so it was done. Women in 19th century Russia largely still didn't read, and I don't know if serfs ever did.