One of my favorite ways to teach counting and one to one correspondence is through play. Here& over 20 super fun counting games and activities for kids that will inspire all kinds of learning through play!
Teaching Addition with Popsicle Sticks - you could use any two different colored stuff around the house: straws, strips of colored paper, two different kinds of dried pasta/beans, etc. Could sit the cup on an answer circle then too.
FREE Play ‘Hidden Numbers’ to help children recognise numbers - this game will get your child to associate shapes with numbers for easy identification. Cut a small hole in an envelope, put a number in it so that only part of it shows,