The mental arithmetic formula table is jingle. After children go to primary school, arithmetic can be said to be the premise of learning mathematics. But for children of this age, it is difficult to remember the formula quickly, and it is necessary to master certain skills. Let's take a look at the mental arithmetic formula table.

The mental arithmetic formula table is jingle 1 1. You can reduce it directly if you don't abdicate.

2. abacus mental arithmetic division nine belongs to the formula, one into one, two into two, three into three, four into four, five into five, six into six, seven into seven, eight into eight and nine into nine. The formula for returning business by abacus mental arithmetic division is nothing more than returning one, two, three, four, five, six, seven, eight and nine.

3. When the sum of ten plus two numbers is more than 10, and there are not enough beads in this gear, dial the complement of the added number in this gear and 1 in the left gear. This method is called 10 addition.

Expansion: Sometimes, a simple formula or phrase can help children remember theorems and formulas in mathematics more vividly. For addition and subtraction within 100 (pen calculation), attention should be paid to pen addition, and the same digits should be aligned; Start with a single digit. If one digit is full of 10, go up to ten digits. The abdication subtraction should be kept in mind, starting from the unit; Who is not enough to retire, don't forget to add ten to the standard; If the interval is 1, it is best to remember that 0 becomes 10.

Abacus mental arithmetic formula

First, the abacus mental arithmetic addition formula table:

One up one, two up two, three up three, four up four, five up five, six up six, seven up seven, eight up eight, nine up nine; Two drops five to three, three drops five to two, and four drops five to one;

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

Second, the abacus mental arithmetic subtraction formula table:

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

One retreats nine, two retreats eight, three retreats seven, four retreats six, five retreats five, six retreats four, eight retreats two, nine retreats one.

Mental arithmetic formula table jingle 2 finger positioning formula

I have a pair of hands, representing ninety-nine; Set the left hand to ten, and I can count to ninety;

Pose your right hand and count from one to nine; It's convenient to add and subtract, so don't worry about calculation.

Finger formula

The index finger extends "L" and the middle finger extends "2";

The ring finger is "3" and the little finger is "4";

Four fingers and a thumb, the thumb is "5" to remember;

Then extend the index finger to the little finger, and "6", "7", "8" and "9" are arranged in numbers.

Point with your right hand and practice the formula.

Take the lead, two tigers contend, in a few words, the four seas are at home, and the grain is abundant.

Six animals are thriving, and the eight immortals are crossing the sea, and nine Niu Yi hairs are urgent.

A word nine, two dragons playing with pearls, three pillars separated, surrounded by enemies, the grain is abundant.

Six gods without a master, seven ups and downs, exquisite, nine Niu Yi hairs, perfect.

(Note: When reading "urgent" or "perfect", make a fist in your right hand and put "1" in your left hand, indicating carry. )

Practice the formula with your left hand pointing outward.

Ten, twenty, thirty, forty; Fifty,

Sixty, seventy, eighty, ninety, one hundred.

(Note: When reading "100", clap your hands, and then put your fist on your chest. )

Mental arithmetic formula table Dingdang 3 1 abacus addition formula table

Plus 1: one up five down four down one to nine into one;

Plus 2: two up, two down, five down, three down, and two down by 81%;

Plus 3: three goes up to three, three goes to five and two, three goes to seven and enters one;

Plus 4: four up, four down, five to one, four to sixty-one;

Plus 5: five goes up to five, five goes to five and enters one;

Plus 6: six to six, six to 41%, six to one to 51%;

Gallon 7: seven to seven, seven to thirty-one, seven to two to fifty-one;

Plus 8: Eight goes up to eight, eight goes to two and enters one, eight goes up to three and goes to five and enters one;

Plus 9: Nine goes up nine, nine goes into one, nine goes into four, and five goes into one.

2 subtraction formula table

Negative 1: one drop of four liters, five liters, one cycle and nine cycles;

Minus 2: two down two, two up three down five, two back to 18;

Minus 3: three times three, three times two to five, three times one to seven;

Minus 4: four times, four times, one to five, four times, one to six;

Minus 5: five down five, five back to five;

Minus 6: six drops six, six retreats one to four, and six retreats one to five to one;

Minus 7: seven down seven, seven back to one to three, seven back to one to five to two;

Minus 8: eight down eight, eight back to one to two, eight back to one to five to three;

Negative 9: nine down nine, nine back for one, nine back for five to four.

3 multiplication 99 formula table

1 10 1 1202 1303 1404 1505 1606 1707 1808 1909;

2 102 2204 2306 2408 25 10 26 12 27 14 28 16 29 18;

3 103 3206 3309 34 12 35 15 3 18 372 1 3824 3927;

4 104 4208 43 12 44 16 4520 4624 4728 4832 4936;

5 105 52 10 53 15 5420 5525 5630 5735 5840 5945;

6 106 62 12 63 1824 6530 6636 6742 6848 6954;

7 107 72 14 732 1 7428 7535 7642 7749 7856 7963;

8 108 82 16 8324 8432 8540 8648 8756 8864 8972;

9 1 09 92 18 93 27 94 36 95 45 96 54 97 63 98 72 99 8 1.

4 abacus division formula table

Once (divided by 1): every one goes in, every two goes in, every three goes in, every four goes in, every five goes in, every six goes in, every seven goes in, every eight goes in and every nine goes in.

Two returns (divided by two): every two into one, every four into two, every six into three, every eight into four, 2 1 plus five.

Three returns (divided by three): three into one, six into two, nine into three, three into one, three into two.

Four returns (divided by four): every four into one, every eight into two, four and two phases add up to five, four and one are greater than two, and four and three are greater than two.

Five cycles (divided by five): every five cycles into one, 5 1 cycle is two, 52 cycles is four, 53 cycles is six, and 54 cycles is eight.

Six returns (divided by six): one every six, two every twelve, six three plus five, six one plus four, six two three greater than two, six four greater than six, and six five eight greater than two.

Seven returns (divided by seven): every seven returns to one, every fourteen to two, every seven to three, every seven to six, every seven to four, every seven to five, every seven to five and every seven to four.

Eight returns (divided by eight): every eight enters one, 84 adds five, 8 1 adds two, 82 adds four, 83 adds six, 856 is greater than two, 867 is greater than four, and 878 is greater than six.

Nine returns (divided by nine): every nine returns to one, nine returns to one, ninety-two returns to two, ninety-three returns to three, ninety-four returns to four, ninety-five returns to five, ninety-six returns to six, ninety-seven returns to seven and ninety-eight returns to eight.