Elementary School, Primary School, Junior High School, Middle School.
Fill in the blank boxes in the pyramid of units of measurement.
This is a classic number wall problem with physical units of measurement.
The value for each brick is formed by adding the numbers in the brick left below and right below the brick. Some bricks are left blank - these have to be filled in with the correct value for the unit of measurement.
The number of units that may be covered by a single value can be limited, this means when two units are selected, km dm and m will not be all part of a single specification, but only dm and m, m and dm, dm and cm etc.
Depending on whether both values below an empty box are given, this may be an addition or a subtraction problem.
The wall height is selectable. With a difficulty setting of "easy", it is always the bottom row of the wall that will be given. With a setting of "difficult", other patterns may occur.
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