1, abacus mental arithmetic is integrated into primary school mathematics, which is conducive to solving the problem of difficult mathematics learning in the enlightenment stage.

2. The intuitive model function of abacus mental arithmetic can cultivate children's mathematical concept ability.

3. Abacus mental arithmetic analysis model can help children understand the structural relationship and quantitative relationship of application problems and improve their problem-solving ability.

Division and quotient extraction formula

Only refund, only refund, two, three,

Did not return 4, did not return 5, did not return 6,

No return 7, no return 8, no return 9,

Nine formulas of division quotient

See no score 9 1, see no score 92, see no score 93,

See four division is 94, see five division is 95, and see six division is 96.

Don't divide 97 by seven, 98 by eight, and 99 by nine.