What is a math formula What is a mental arithmetic formula table?

Primary school mathematics slips away, a number divided by a number of several digits nursery rhyme, first look at the highest digit of the dividend, the high position is not enough more than one bit, divided to the dividend, the quotient is written in which digit, not enough quotient 1 to write 0, the quotient in the head and tail counts, the remainder should be smaller than the divisor, so that the operation is correct.

Multiplication mantra nursery rhyme, a frog with a mouth, two eyes and four legs. Two frogs with two mouths, four eyes and eight legs. Three frogs, three mouths, six eyes, and twelve legs. Four frogs open their mouths and jump into the water with a tom.

The math mantra slips smoothly as follows:

1. Two-step calculation application problems.

Two-step calculation application questions, read the questions carefully and review the questions. The solution is linked one by one, and the middle problem is the key. The quantitative relationship should be accurate, and the calculation steps should be clarified. Grasp the two ends of the middle belt and answer the questions accurately.

2. Multi-digit reading songs.

The reading should start from the high position, which digit is the number to read; If there is a zero at the end of each level, you don't have to read it out in mind; The other digits are continuous zeros, and only one is read carefully; Add "10,000" at the end of 10,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,

3. Multi-digit writing songs.

Write the number from the high position, and write a few digits. Which digit has no unit, use "0" to keep in mind.

4. Multi-digit size comparison song.

The number of digits is different than the size, the number of bits is large, and the number of bits is small. The number of digits is the same as the size, and the high digits are known by the ratio.

5. Abacus reading and writing.

The little abacus is really magical, and it is easiest to read and write. The four-digit level one is the key, and the reading and writing are all from the high position. 0 is read at the beginning of the level, and 0 is not read at the end of the level. Hundreds of millions of levels imitate a level, and add units after reading. Write down one level at a time, and the beads do not occupy a place by beam 0.

The mental arithmetic formula table slips smoothly with:

1. The mental arithmetic addition formula table of the year is smooth: the addition of non-carrying, the addition of carrying, the direct addition, the full five addition, the addition of ten, and the breaking of five into ten.

2. The mental arithmetic subtraction formula table is smooth: the reduction of non-abdication, the reduction of abdication, the direct reduction, the reduction of breaking five, the reduction of abdication, and the reduction of ten to make up for five.

3. The formula of division and withdrawal is smooth: no retreat - one down, no retreat - two, no retreat - three in the side hall, no retreat - four down, no retreat - five, no retreat - six, no retreat - seven, no retreat - eight, no retreat - nine down.

4. The nine-mantra formula of division is smooth: see one without division as nine-, see two without division as ninety-two, see three without division as ninety-three, see four without division as ninety-four, see five without division as ninety-five, see six without division as ninety-six, see seven without division as ninety-seven, see eight without division as ninety-eight, see nine without division as ninety-nine.

Abacus Mental Arithmetic Addition Formula Table:

One on. One, two.

Two, three. Three, four.

Fourth, five. Five, six.

Six, seven. Seven, eight.

Eight, nine on nine; Two down and five go.

Three, three, five go.

Two, four down five to one.

One goes nine in. One, two go and eight in.

One, three to seven in.

One, four to six in.

One, five to five in.

One, six to **.

One, seven go. Three-in.

One, eight to two in.

One, nine go and one into one.

Mental arithmetic subtraction formula table:

One time. One, two.

Two, three down. Three, four times.

Four, five times. Five, six.

Six, seven. Seven, eight.

Eight, nine under nine; One up and four up.

Five, two up and three go.

Five, three up and two go.

Five, four, one to five; One return and one return.

Nine, two retreat one return eight volt imitation, three retreat and one return.

Seventh, four retreats and one return.

Sixth, five return and one return.

Five, six return and one return.

Fourth, eight retreats and one return.

Second, nine back one back one.

The mental arithmetic formula table slips smoothly as follows:

1.Addition formula table: non-carry addition, carry addition, direct addition, full five addition, ten addition, breaking five into ten addition.

2.Subtraction formula: non-abdication subtraction, abdication subtraction, direct reduction, breaking five subtraction, abdication subtraction, retirement ten thoughts of rent compensation five reduction.

3.Division formula table: divisor one to see one, one bit is not enough to see two. Divided to which quotient and which remainder is smaller than the divisor. The remainder is not enough to add another one, and it is not yet possible to add to the next high slippage.

4.Multiplication formula: one to one, one to two to two, one three to three, one to four to four, five to five, six to six, seven to seven, eight to eight, nine to nine.

Mathematics is a slip of the tongue for the following:

1. Multiplication formulas and nursery rhymes.

A frog has one mouth, two eyes and four legs. Two frogs with two mouths, four eyes and eight legs. Three frogs, three mouths, six eyes, and twelve legs. Four frogs open their mouths and jump into the water with a tom.

2. A number divided by several digits children's rhymes.

Let's start with the dividend.

The highest position, the high position is not enough for one more; Divide to which digit is divided, the quotient is written in which digit, if there is not enough quotient 1, write 0, and the quotient counts the first and last digits, and the remainder.

It should be smaller than the divisor so that the operation is correct.

3. Decimal addition and subtraction nursery rhyme.

It's easy to compare the size of the decimals, first put them all up, the decimal points, the digits should be right, and then compare them. First of all, compare the highest bit, the highest bit is the same as the lower bit. In the end, it is divided into high and low, which is higher and which is bigger.

Keep it in mind and don't forget. Division is a decimal division is a decimal and the shift is to be remembered. Move the decimal point so that it becomes an integer, move the divisor by a few digits, the dividend is the same amount, if the number is not enough, add 0 to fill the place.

4. Four mixed operation nursery rhymes.

Go through the whole topic plan and see if it can be simple; From left to right, multiply and divide first, then add and subtract; The parentheses are small, medium and large in order, first counting the inside and then the outside; Horizontal calculation and vertical inspection, step by step check is the key.

5. Solve the problem of nursery rhymes.

Read the question several times to find the key from it; Look at what you want first, and then look for conditions; Reasonable formulas and careful calculations; Seek multiple solutions to one problem, and the unit should not forget; The results should be checked, and the answers should be written at the end. understanding of length, area, volume, and volume; The length of a line, the area of a large area; The volume occupies the space, and the volume is counted inside.

6. Rounding up children's rhymes.

The rounding method is good, approximate numbers.

There is a way to find it; Take which one to look at the next position, and then compare it with the 5 characters; It is 5 big 5 forward 1, less than 5 all rounded;

The equal sign is replaced with an approximate equal sign, so that people can understand it at a glance.

7. The problem of chickens and rabbits in the same cage.

solution. Chickens have two legs and rabbits have four legs. Count the head and body first. Then press the chicken to divide the feet.

8. Sequence of operations.

Playing bamboo boards, even the sky, all the students listen to me. Today I don't put other tables, four calculations.

Let's talk about the mixed questions to be calculated, and a clear order is the key. The same level operation is the best, from left to right. Both levels of operation occur, first multiplying and dividing and then adding and subtracting. What to do if you encounter parentheses, the parentheses are counted first, and the parentheses are in the brackets.

Count inside and back, the order must not be messed up, every step is checked, and you are happy and happy.

9. Abdication and subtraction.

Abdication and subtraction should be kept in mind, starting from the single digit first; Which one is not enough to retire from the front, and don't forget the standard plus ten; If the next position is retreated by 1,0 to ten, it is best to remember.

10. Subtraction of continuous abdication.

See 0, go ahead and see which one is on it. Borrowed and walked backwards, 0 is a bit seen as 9.

The math mantra is as follows:1. Addition of rational numbers.

Two numbers of the same sign are added together, and the absolute value is added.

Add the same sign. The different signs increase and decrease, and the large number determines the symbol. Sum the opposite numbers of each other, and the result is zero that must be remembered.

Note: Large decrease refers to the magnitude of the absolute value.

2. Subtraction of rational numbers.

Minus positive equals plus negative, and minus negative equals plus positive.

3. Merge similar items.

When it comes to merging similar items, the rule must not be forgotten. Only the algebraic sum of the coefficients is found, and the letter exponents are left as they are.

4. The rule of going and adding brackets.

To remove parentheses or add parentheses, the key is to look at the hyphenate.

The expansion number is preceded by a positive sign, and the parentheses are added unchanged. The parentheses are preceded by a minus sign, and the parentheses are changed when you add them.

5. Solve equations.

It is known that the unknown is separated, and the separation must be completed by moving. Shift plus subtract subtract add and multiply, shift multiply and divide and divide.

6. Square difference formula.

The difference between two numbers and multiplication is equal to the square difference of two numbers. Accumulation and difference.

Change two items, perfectly squared is not it.

7. Perfect square formula.

The sum of two numbers or the square of the difference.

There are three formulas. The first square and the last square, the first and last two times the middle. The square of the sum is added to the connection, and the difference is first subtracted and then the difference is added to the square.

8. Perfect square formula.

The first square is the last square, and the second is the first and the last is in **. The square of the sum is added and then added, and the difference is added by the square.

The single digit is greater than the ten digits 1 9 formulas:The single digit is a few bends back to a few, and the left side of the bend finger is the hundred, 34 9 = 306 89 9 = 801.

The bend finger reads 0 as the ten digit, and the bend finger is the right digit of the state. 78×9=702 45×9=405。

The single digit is greater than the ten digits 9 formulas:The single digit is a few bends back to a few, the original ten digits are hundreds, 38 9 = 25 9 = 225.

Subtract the number of hundreds from the left, and the remaining fingers are ten, 13 9 = 117 18 9 = 162.

The bend finger serves as the dividing line.

The crooked finger is a bit on the right.

The scramble is the same as the ten 9 formulas:The single digit is a few bends back to a few, and the left side of the bend finger is a hundred, 33 9 = 297 88 9 = 792.

The crooked finger reads 9 as the ten, and the right digit of the crooked finger is the single digit. 44×9=396。

The single digit is 9 smaller than the ten:Ten digits minus 1, write hundreds, and write ten digits for the original single digits.

Write a single digit (plus complement) with a few hundred differences, such as a difference of dozens of rounds and add ten digits early.