Digit Dog and Calculating Cat are playing a game of *Bone Splat!*

**You need:**

A “splat” and some bones (download here).

**To play:**

First decide on the total number of bones – in this game they are exploring pairs of numbers that total 10. Count out that number of bones and put a digit card in the empty box on the “splat”.

Player One: close your eyes.

Player Two: hide some of the bones under the “splat”.

Player One: open your eyes and work out how many bones have been hidden under the splat.

*Explain how you worked it out. Convince your partner that you are right.*

Encourage learners to explain how they worked out the number of bones that are hidden. They might:

- Use a 10 frame and objects (or visualise them like Calculating Cat);
- Use a Numicon shape and toy bones or pegs;
- Use a number line to count on;
- Draw a picture;
- Just know the number bond.

Record some number sentences to show how many different ways the bones can be hidden. For Digit Dog’s problem we could write: 6 + 4 = 10, 4 + 6 = 10, 10 – 4 = 6, 10 – 6 = 4.