For example on number 1 the time signature is 4/4 , that means there has to be 4 beats in between each bar line. They have already put in a half note which is equal to 2 beats. You can either put another half note or two quarter notes.
Remember
Whole Note = 4 beats
Quarter Note = 1 beat
Half Note = 2 beats
Dotted Half Note = 3 beats
Can you please take a better picture?
i can barely see it.
They are called feretilty figures.
Especially ceramics and porcelains, and as a result it gave rise to many imitatiors and scammers. <span />