The table of mental abacus formulas includes:

1�� Table of multiplication formulas for abacus calculation:

One on one, two on two, three on three, four on four, five on five, six on six, seven on seven, eight on eight, and nine on nine;

Two down five to three, three down five to two, four down five to one;

One goes nine in one, two goes eight in one, three goes seven in one, four goes six in one, five goes five in one, six goes four in one, seven goes three in one, eight goes two in one, nine goes one in one;

Six up one goes five in one, seven up two goes five in one, eight up three goes five in one, nine up four goes five in one;

2�� Table of Abacus Mind Subtraction Tips:

Below 1, below 2, below 3, below 4, below 5, below 6, below 7, below 8, below 9;

On one go four go five, on two go three go five, on three go two go five, on four go one go five;

One refund one return nine, two refunds one return eight, three refunds one return seven, four refunds one return six, five refunds one return five, six refunds one return four, eight refunds one return two, nine refunds one return one;

Six refunds and one return to five go to one, seven refunds and one return to five go to two, eight refunds and one return to five go to three, nine refunds and one return to five go to four;

3�� Abacus mind calculation division nine return pithy formula:

One return: every one enters one, every two enters two, every three enters three, every four enters four, every five enters five, every six enters six, every seven enters seven, every eight enters eight, and every nine enters nine.

Two returns: every two into one, every four into two, every six into three, every eight into four, two in one adds five.

San Gui: every three to one, every six to two, every nine to three, three to three, and three to six.

Four returns: every four enters one, every eight enters two, four two is added as five, four one two is more than two, four three seven is more than two.

Five returns: every five goes into one, five times one makes two, five times two makes four, five times three makes six, and five times four makes eight.

Six returns: every six enters one, every twelve enters two, six three adds five, six one adds four, six two three remains two, six four six remains four, six five eight remains two.

Seven returns: every seven to one, every fourteen to two, seven to one plus three, seven to two plus six, seven to three, four to two, seven to five to five, seven to five to seven, seven to eight to four.

Eight returns: every eight enters one, eight four adds five, eight one adds two, eight two adds four, eight three adds six, eight five six two, eight six seven four, eight seven eight six.

Nine returns: every nine enters one, nine adds one, nine adds two, nine adds three, nine adds four, nine adds five, nine adds six, nine adds seven, and nine adds eight.

4�� Abacus calculation division method for returning business tips:

If there is no division or refund, it will be returned to one; if there is no division or refund, it will be returned to two; if there is no division or refund, it will be returned to three,

If there is no division or refund, it will be returned to four, if there is no division or refund, it will be returned to five, and if there is no division or refund, it will be returned to six,

If there is no division or refund, it will be returned to seven, if there is no division or refund, it will be returned to eight, and if there is no division or refund, it will be returned to nine,

5�� Nine secrets to division in abacus calculation:

When you see one without division, make nine one; when you see two without division, make nine two; when you see three without division, make nine three,

If you see four without division, make it 94; if you see five without division, make it 95; if you see six without division, make it 96,

If you see seven without division, make 97; if you see eight without division, make 98; if you see nine without division, make 99.