Discontinued App

Abacus Calculator

Chinese abacus calculator for counting arithmetic. Now you can exercise your arithmetic with this virtual abacus as one of the most ancient calculators ...

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Description

Chinese abacus calculator for counting arithmetic. Now you can exercise your arithmetic with this virtual abacus as one of the most ancient calculators invented by the Chinese. Features: • 24 rainbow bead colors (12 shiny bead colors and 12 matt bead colors) for iPad • 12 shiny bead colors for iPhone • 12 rainbow frame colors for iPad • Matt or shiny bead texture for iPad • Addition and subtraction arithmetic • 8-digit precision • Decimal system • Great educational tool to teach arithmetic as counting beads for kids too • Chinese abacus version has the advantage of the carry digit for carrying-over arithmetic compared to the Japanese abacus version. How to calculate using the abacus: • Each column of beads represents a decimal digit. • Arithmetic calculation starts from right to left digits. • The 2 beads in top rows represent digits 5 and 10. • The 5 beads in bottom rows represent digits 1, 2, 3, 4 and 5. • For addition, top-beads move down while bottom-beads move up. • For subtraction, top-beads move up while bottom-beads move down. • Numbers are represented by the beads centered between the horizontal middle bar. • E.g.: • Move 3 bottom-beads up = 1 + 1 + 1 = 3. • Move 1 top-bead down = 5. • Move 1 top-bead down & 3 bottom-beads up = 5 + (1 + 1 + 1) = 8. • If 5 bottom-beads moved up, it is carried-over to the top-row, i.e., 1 + 1 + 1 + 1 + 1 = 5. At this point, move one top-row bead down to represent 5 (carry-over) while restore the original 5 bottom-row beads by moving them down (because 5 is already represented by the top row bead as the "carry" digit, you need to subtract 5 from the bottom beads so you won't double-count the 5). • Similarly, when the top 2 beads are moved down, i.e., 5 + 5 = 10, it will carry over to the next digit (next left column). So you add one bead to the adjacent left bottom-column, and restore the original 2 top-beads back up (because it is already carried over by the left digit, you need to subtract the original beads so you won't double-count the 10).

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Technical specifications

Version: 1.0.1

Size: 1.06 MB

System:

Price: 0,88 €

Developed by IntelligeSoft.com

Day of release: 2010-08-17

Recommended age: 4+

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