In the Mortensen Math, aka Mortensen More Than Math, program there are five strands of mathematics; Algebra, Arithmetic, Calculus, Measurement, and Problem Solving. There are three levels of Arithmetic, four levels of Algebra, Measurement, and Problem Solving, and five levels of Differential Calculus. Each level has ten booklets per strand (20 pages per booklet). The beginning books are so simple that the prerequisite for beginning the program is being able to count to nine.
All the strands of Mortensen Math deal with the exercise of counting. The problems are set up visually and the student counts to find the answer. Each strand reinforces the concepts being covered in another strand. It is therefore recommended that the student work in all the strands simultaneously rather than going through an entire strand on its own.
The workbooks are designed to be used alongside concrete manipulatives for a hands-on approach.