The Wikipedia article on decoupling capacitors specifies a 100 nF ceramic capacitor per every logic chip, with more for complex logic chips. But can you get away with less if you are using simple logic and low frequencies? Yes. 10 nF ceramic capacitors per every cluster of quad NAND integrated circuits appears to work well. You could also use 22 nF. 100 nF per chip is primarily needed for faster circuits.
But one important key, when you pick a decoupling capacitor value, try to stick with the same capacitor values consistently throughout the circuit. Otherwise, you can get other problems.
And, remember, the power supply source typically has a decoupling capacitor of a few hundred uF.
20200301/https://en.wikipedia.org/wiki/Decoupling_capacitor
20200301/DuckDuckGo decoupling capacitor quad nand ic
20200301/https://www.cypress.com/file/135716/download
20200301/https://www.reddit.com/r/electronics/comments/870wj0/8bit_alu_made_using_only_quadnand_ics/