| 摘要 |
This invention is about adding additional parts (augmentations) to a simple abacus to enhance its effectiveness when used by beginning learners in: learning to count numbers from one to one hundred; to learn addition and subtraction; and to later learn other math processes. And these (augmentations) are of four main types: 1.) blank sheets to be written on by the student, parent or teacher; 2.) larger blank sheets to hide unneeded rows of beads and unneeded numbers. 3.) printed grids of numbers where these numbers are in a are sequence of numbers from #1 to # 100, where these numbers are divided Into ten segments that correspond to ten rows of beads; and where each printed number appears above a bead in the counting area; and 4.) a second type of printed grid of numbers that are the “products” of a multiplier and a multiplicand (which are ten or under in value.) |
