A domino has two halves with dots.
One half is empty. Its dots are missing.
On the right you see how many dots both halves should have altogether.
Draw the missing dots and write the number in the box.
The filled-in example below shows the answer.
Example
- 3 + 4 = 7
- 2 + 4 = 6
For parents
What does this exercise practice?
Completing to a target sum trains flexible number decomposition and prepares for subtraction as the reverse of addition.
Common pitfalls
Some children add the visible number and the target. But the answer is how many more are needed to reach the target.
How to practice at home
With real dominoes cover one half and let the child guess how many dots are underneath.
Related: Dominoes, Break apart