A domino tile has two halves with dots (pips).
Count the dots on the left and the dots on the right, then add them together.
Example: There are 2 dots on the left and 4 dots on the right.
2 + 4 = 6, so the tile shows 6 dots.
Tip: An empty half counts as 0.
The numbers filled in show the solution.
Example
For parents
What does this exercise practice?
Grasp quantities quickly and add them in your head.
Common pitfalls
An empty half is easily overlooked; it counts as 0, not as 1.
How to practice at home
Play with real dominoes and add up the dots on each tile.
Related: What does multiplying mean?