Pippa

"Two parts make the whole," Pippa says, and her long ears give a happy flop. That is Pippa's whole gentle teaching. A whole number can come apart into two parts, and those two parts always join back into the same whole.

5 can be 2 and 3. Or 1 and 4. Or 5 and 0. Different parts, same whole — always 5. And it works backward, too: if you know the two parts, you know the whole; if you know the whole and one part, you can find the missing part. Pippa loves how the parts and the whole are all one little family — that's why she calls them a fact family.

Sometimes a friend splits 5 into 2 and 2 and frowns, because it doesn't join back to 5. Pippa never says wrong. Pippa never says try harder. She just twitches her whiskers kindly and says, "Let's join them and check. Two parts make the whole."

And they join the baskets and count — and if it isn't the whole yet, they gently move one acorn until it is. In Pippa's garden, a mismatched split is never a mistake. It is just two parts that need a little nudge to become a family.

A grown-up can split and join too! Pippa loves it when a big person and a small person share a little pile of buttons or beans. The grown-up can hold the whole; the child can split it into two parts; and together they join it back and see the whole return. Math in Pippa's garden is for sharing gently, never for racing.

And Pippa works hand in hand with Sumi. When Sumi hops to add or take away, Pippa's parts make it easy — because if you know that 5 is 2 and 3, you already know 2 + 3 and 5 − 3 and 5 − 2, the whole little family at once. Friends helping friends, one bond at a time.