Suitable for K-12 grades: Grade 1 Grade 2
Elementary School, Primary School.
A series of marbles represents a subtraction term - empty spaces to be filled in term.
A subtraction term is illustrated in the form of two row of marbles with five each:
The minuend is represented by a set of marbles. As the cardinality of the subtrahend is equivalent to the number of marbles that are taken away from the original set of marbles, these marbles are marked as striked out. The remaining marbles stand for the difference that is left when the subtrahend is taken away from the minuend.
Below the graphical representation of the subtraction term, the term itself is shown with blank spaces for the
depending on the setting of the problem - there is an option to configure the spaces that will have to be filled in.
The number of problems presented can be configured. There is a practice mode for a single number, if chosen, this number will always be the minuend. Otherwise, all numbers will be chosen at random.
The first problem may be selected to be a sample problem, which will be presented with the answer.
Topics: Arithmetic Elementary arithmetic Whole Numbers
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