by Edwin Myers
This is a proven tool for strengthening early math facts and concepts. It presents over and over the same problems so that students learn by rote, and achieve mastery. Easy to use "Quik keys" make it a simple matter to score the student's drill pages. These can be used by older students, if necessary, but are written with the grade levels indicated in mind.
In 2011, Calculadder stopped printing the books in favor of the PDF CD-ROMS. Both of these "volumes" include three books, CD 1 books 1-3 and CD 2 books 4-6.At $29.95, they are only marginally more expensive than buying one of the printed books, and far more "green."
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