CalcuLadder consists of a sequence of 96 one-page standard arithmetic drills, divided into six one-year wirebound workbooks spanning 16 drills each. The publisher asserts that even though the workbooks are named CalcuLadder 1 through CalcuLadder 6, any workbook may be used as needed at any grade level along with any math curriculum. The drills are timed, and there is a certificate of achievement available for each completed section. The books may be purchased for $21.95 apiece, or three books can be purchased as part of a “Master CD” for $29.95, although the drills must then be printed before they can be used by the student.
Website: Calculadder Math Drills (may contain affiliate links)
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