Creative math
There are certain numbers that freak people out when they see them on their birthday cakes. 40, 50, sometimes even 30 are a big deal to mark the passing of time. Age is just a number, and there really isn’t any need to be sad about a new birthday, especially when it’s another opportunity to be spoiled by your nearest and dearest, and to eat cake.
The best of husbands, though, are the ones who try and make you feel better even if there’s no real need for you to be sad. This fine specimen of matrimony came up with a genius way of distracting his wife from her latest age, by making her do maths.