Frog Spot: Subtraction Fun (using frogs on a log for bendy snake for carrot patch, octopus legs for I love this idea for numeracy!
Cupcake lines aren't just for crafts! Use them to practice counting coins! Math with Cupcake Liners: Counting Money Game
Students would have a cup filled colored counters. They should shake it up and dump it out to count the red counters and yellow counters. This teaches cardinality, as well.
Learning basic maths the Singapore method
Coin sorting is super easy kid entertainment! Keeps them busy and teaches pre-math skills.