Elementary School, Primary School, Middle School.
What multiple of a power of ten has been added?
A multiple of a power of ten has been added to a positive natural number. The result and the first summand, the positive natural number, is given. The power of ten summand has been replaced by a blank space. The correct number has to be filled in.
The first summand is a natural positive number with a defined number of places. The second summand is a multiple of a power of ten. That means that the second summand's first digit will be in the range 1-9, while the other ones will be zero. The second number will always have fewer places than the first one.
Carries will never occur.
The number of places for both numbers can be specified. It can be specified that the first number will only have zeroes in the range of places the second number covers.
The number of problems can be selected.
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