A frog has a mouth, two eyes and four legs.

Two frogs have two mouths, four eyes and eight legs.

Three frogs have three mouths, six eyes and twelve legs.

Four frogs with four mouths jumped into the water.

Second, divide a number by several children's songs.

Look at the highest dividend first. A high dividend is not enough.

Quotient is written anywhere except dividend.

If the quotient is less than 1, write 0 to calculate the first and last digits of the quotient.

The remainder should be less than the divisor, so that the operation is correct.

Third, the decimal addition and subtraction nursery rhymes

Calculate decimal addition and subtraction, align keys with decimal points,

You can add and subtract by filling the last number with 0.

Decimal size comparison nursery rhymes (self-edited)

Decimal size is relatively easy. Put them all on first.

Decimals and numbers should match, and then compare.

Compare the highest bit first, and the ratio of the highest bit to the low bit is the same.

Finally, it is divided into high and low, which is higher and which is bigger.

Keep it in mind.

Division is the division of decimals

Division is a decimal, so remember to shift.

Move the decimal point to make it an integer,

Move the divisor a few places, and so will the dividend.

If the number of digits is not enough, add 0 to make up the position.

Fourth, elementary arithmetic nursery rhymes

Look at the whole project and see if it can be simple;

Take the formula from left to right, multiply first, divide then add and subtract;

Parentheses are small, medium and large, with the number inside first and then outside;

Horizontal calculation and vertical test, step by step is the key.

Fifth, solve the application of children's songs

Look at the topic several times to find the key points;

Look at what you want first, and then find conditions;

Reasonable calculation formula, careful calculation;

Ask for more answers to a question, and the unit will not forget it;

Check the results and finally write the answer.

Understanding of length, area, volume and volume

One line is long and has a large area;

Volume takes up space and volume counts.

Sixth, the rounding method of children's songs

The rounding method is good, and the approximate figure can be found out by law;

Take which one to look at the next one, and then compare it with five words;

It is 5 big 5 forward 1, and all less than 5 are discarded;

The equal sign is replaced by an equal sign, which makes people understand at a glance.

Seven, the solution of the problem of chickens and rabbits in the same cage

A chicken has two feet, and a rabbit has four.

Count your head and body first. Then press the chicken apart.

Eight, the order of operating songs

Playing bamboo board, Lian Tian, students listen to me.

I won't talk about other tables and four operations today.

Clear order is the key to the calculation of mixed test questions.

The operation at the same level is the best, counting from left to right.

There are two levels of operations, first multiplication and division, then addition and subtraction.

What should I do if I encounter parentheses? It first appears in parentheses,

After parentheses, the order cannot be out of order.

Every step has been tested, right and happy.

Nine, abdication subtraction

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.

Successive abdication subtraction

When you see 0, go and see which one has it.

Borrowed and walked back, 0 is a bit like 9.

Eleven, two-step calculation application problems

Calculate the application problem in two steps, read and review the problem carefully.

The intermediate problem is the key to solve the problem.

The quantitative relationship should be accurate and the calculation steps should be clear.

Grasp both ends of the middle band and answer the questions accurately.

Twelve, multi-digit reading of French songs

Reading should start from a high position, and whoever reads it several times;

If there is a zero at the end of each level, there is no need to remember it in your mind;

Other numbers are zero in a row, read only one digit, and remember them carefully;

Reading at the end of ten thousand levels? Wan? , add reading at the end of the billion level? Billion? ,

Always remember the reading rules.

Thirteen, multi-digit writing songs

Write numbers from the top and write as many as you want.

Who doesn't have a unit to use? 0? Remember the top position.

Fourteen, multi-digit size contrast songs

The number of digits is different from the size, and the number of digits is more than the number of digits.

The number of digits is the same as the size, and the high position is known.

Fifteen, multi-digit rewriting songs

Behind ten thousand people? 0? Remove it, add 10 thousand words and change it.

Behind a billion bits? 0? Remove it and add a billion words to change it.

A phrase about the actual comparison of plans.

I plan to actually compare the application problems and analyze them carefully, so don't worry.

The quantitative relationship is very important, and the relationship before and after is very subtle.

Write the relationship first, which leads to the solution to the problem.

The plan is actually in front, compare a line up and down.

The specific quantity should be reflected, and the constant quantity is the key.

Look at it accurately according to the number of days, and then fill in the blanks.

According to the equation, the arithmetic method is also simple.

Sixteen, about getting together? Ten? French

Think of 1 when you see 9, and think of 2 when you see 8.

Think of 3 when you see 7, and think of 4 when you see 6.

When you see the big corner decimal system, switch the two numbers first.

10 shares

9 and 1, naughty

7, 3, 8 and 2 are also naughty.

Blow 6 liters 4(6 like a whistle, 4 like a flag)

What a clever little hand (let the students shake hands like dividing 10 into 5 and 5)

Seventeen, commercial songs multiplication formula:

(1) If you want to multiply and divide, you can tell me what is missing in the formula.

(2) To find the quotient by multiplication formula, first think carefully about the formula:

If a number is missing, it is a quotient.

18. Children's songs that know the time

When the hand passes the number, it will show the time.

If you want to ask how many points you got, please look at the minute hand carefully.

For some simple subtraction operations:

If you increase more, you will decrease, and if you increase less, you will increase more;

If you reduce more, you will increase, and if you reduce it, you will reduce it again.

The law of association is not difficult. Let's calculate the combination of two numbers first.

Nineteen. The problem of planting trees

Children, open your hands. Everyone has five fingers.

There are some gaps between your fingers. Please take a closer look.

Division in which the middle or last bit of quotient is 0.

I am 0, and I am good at division.