Right now many people spend much more time at home. A good time to sit and make some nice boxes for gifts, small items such as jewelry, or for cookies you have made.
There are many examples on YouTube of slightly different techniques and results. Here just one example.
You do not have to think about school work when making such boxes, but for those who wish to see the mathematics there are many concepts that are being used and applied (division, fractions, angles, proportions, measurement, square etc.)
If you wish to make it a real challenge. Try to make a box out of one piece of paper where three ping-pong balls, or three golf balls, fit snugly. (It does not have to be a rectangular shape).