Tompert. Just a Little Bit

Just a Little Bit is a children's book by Ann Tompert, with art by Lynn Munsinger, published in 1993. It is available at the Internet Archive.

Here is a YouTube read-along:

This is an absolutely adorable book, with a very simple plot: the elephant and the mouse want to play on the see-saw together, but of course the mouse needs help to lift the elephant up, so a huge assortment of animals piles on, trying to lift up the elephant. The story is not told cumulatively one by one, but the pictures are cumulative, of course, as you can see:

The animals are on the verge of giving up, but finally a little beetle shows up and adds the last tiny bit of weight that is needed. So, I'm calling this the "final straw" type of story, although this is a much happier outcome than the final straw that breaks the camel's back: thanks to the "little bit" that the beetle added, the animals are all able to play together on the see-saw at last. The "final straw" type of story has a lot in commong also with stories like the mitten type of story and stories about squeezing in.)

Just look how happy the elephant is when the see-saw finally goes up!

It would also be fun to make a math game: give people a long list of animals with realistic weights (I don't even know how much an elephant really weighs!) so that they can make their own combination of the animals needed to lift the elephant on the see-saw. It would be fun to have a gigantic list, so that everybody could make their own unique combinations. For a chain tale book with math games included, see Twelve Circus Rings.