IntelligeSoft


- 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.
- Great tool for education to teach kids how to you carry digit for arithmetic.
- The Chinese abacus has the advantage over Japanese abacus because it uses the carry digit explicitly for arithmetic.
- The Chinese abacus has both carry 5 and carry 10 digit, making it one of the most ingenious and intuitive ways to do arithmetic.
Features:
- 24 rainbow bead colors to choose from
- 12 rainbow frame colors to choose from
- Matt or shiny bead texture to choose from
- All-in-one 1-click design
- Easy to use, just swipe beads
- Addition and subtraction arithmetic
- 8-digit precision
- Decimal system
- Can be used as counting beads for kids
- Carry 5 and carry 10 digit for arithmetic.
Chinese abacus basics, representation of decimal numbers:
Columns of beads:
- Each column of beads represents a decimal digit.
- Right column represents 1's, i.e., 1 - 9, the least significant digit.
- The second right column represents 10's, i.e., 10 - 90, the next significant digit.
- The third right column represents 100's, i.e., 100 - 900, etc.
Rows of beads:
- The 2 beads in the top rowrepresent digit 5 or 10.
- The 5 beads in the ottom row represent digit 1, 2, 3, 4 or 5.
Position of beads:
- Moving one bottom bead up adds 1.
- Moving one top bead down adds 5.
- The digits represented by the beads centered on the middle horizonal bar is the number it adds up.
- Zero is represented by no beads next to the middle horizontal bar, i.e., all top beads up, and bottom beads down.
How to calculate using the abacus:
- Arithmetic calculation starts from right to left digit columns.
- In adding,
- top beads move down while bottom beads move up.
- In subtraction,
- top beads move up while bottom beads move down.
- 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.
Using carry digit in addition arithmetic:
- Carrying Carry-5 digit over:
- If 5 bottom beads moved up, it is carried over to the top row,
- i.e., 1 + 1 + 1 + 1 + 1 = 5.
- i.e., 5 bottom beads are equivalent to 1 top bead.
- At this point, a top row bead will move down to represent 5,
- then restore the original 5 bottom row beads by moving down too
- (because 5 is already represented by the top row bead as the "carry" over, so the bottom beads have to be subtracted in order not to double-count the 5 in the carry over).
- Carrying Carry-10 digit over:
- 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 row,
- and restore the original 2 top beads back up
- (because it is already carried over by the left digit, you need to subtract it so you won't double-count the 10).
Using carry digit in subtraction arithmetic:
- If there are not enough beads to subtract in a column, borrow the carry digit.
- Borrowing carry-10 digit, e.g..:
- 7 = 10 - 3, so you subtract 10 and add 3.
- i.e., you remove one bead from the next-left column, and add 3 beads to the current column.
- Borrowing carry-5 digit, e.g.:
- 2 = 5 - 3, so you subtract 5 and add 3 in the same column,
- i.e., you remove one bead from top row, and add 3 beads to the bottom row.
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