Two bricks next to each other add up to the brick above.
That is how you build the wall brick by brick from the bottom up.
Example: At the bottom are 12,000 and 8,000.
12,000 + 8,000 = 20,000, so 20,000 goes in the brick above.
Tip: if a lower brick is missing, work back from the top: top brick minus the known brick.
The numbers written in show the answer.
Example
For parents
What does this exercise practice?
Linking addition and completion tasks with big numbers and planning several calculation steps within one structure.
Common pitfalls
Children sometimes add bricks that are not next to each other. Tapping the two neighboring bricks with a finger helps.
How to practice at home
Draw a small wall with three bricks at the bottom and let your child work it up with big numbers.
Related: Number Sentences with a Gap, Written Addition, Inverse Operations