Two bricks next to each other add up to the brick above them.
This is how you build the wall brick by brick, from bottom to top.
Example: At the bottom are 123 and 87.
123 + 87 = 210, so the brick above shows 210.
Tip: If a lower brick is missing, work backwards from the top: upper brick minus known brick.
The numbers filled in show the solution.
Example
For parents
What does this exercise practice?
Combine addition and complement problems and plan 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 calculate it upward.
Related: Calculation, Number house, Inverse