How to measure half and quarters with tablespoon or teaspoon

In an emergency you can measure half a spoon relatively precise with just a normal spoon (either a table spoon or a teaspoon) quarters are less precise.

Take your spoon and fill it as normal for the spoon measurement. Now take a knife or an almost sharp plastic object and 'cut' the filling of the spoon in half, cutting from the handle to the tip. Next you put one half of the content of the spoon back in the container. (So doing all this over the container or a clean plate will work.)

For a quarter spoon you do the same but repeat with a second cut at a 90 degree angle, which is harder to guess.

I would likely use the plastic dough scraper which lives in my kitchen drawer but I remember my mother using a small and not too sharp knife, as you do not want to damage your spoon.