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.
2, a number divided by several children's songs
Look at the highest dividend first, which is not high enough; Write the quotient anywhere except the dividend, and the quotient is less than 1 write 0. In quotient, the first and last digits, the remainder is less than the divisor, so the operation is correct.
3, decimal addition and subtraction nursery rhymes
Calculate decimal addition and subtraction, align decimal points, and add and subtract the last digit with 0.
Decimal size comparison nursery rhymes
Decimal size is relatively easy. Put them all on first, the decimal point and the number of digits should be matched, and then compare them. 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 decimal division. Division is a decimal. Remember the transformation. Move the decimal point to make it an integer, move the divisor a few places, and the dividend will be the same. If the number of digits is not enough, add 0 to make up the position.
4, 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.
5. 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.
Step 6 finish 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.
7. Solving 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.
8, operating songs
Playing bamboo board, Lian Tian, students listen to me. I don't want to talk about other tables and four operations today. Clear order is the key to calculating 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? Count the parentheses first, then the parentheses. The order must not be out of order. Every step has been tested, both correct and happy.
9, 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.
10, continuous abdication subtraction
When you see 0, go and see which one has it. Borrowed and walked back, 0 is a bit like 9.
1 1, two-step calculation of 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.
12, 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; Read "ten thousand" at the end of ten thousand categories, and read "one hundred million" at the end of one hundred million categories. Always remember the reading rules.
13, multi-digit song writing
Write numbers from the top and write as many as you want. Remember which one has no unit, and use "0" as the top position.
14, multi-digit size comparison song
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.
15, multi-digit rewriting song
Remove the "0" after ten thousand digits and add ten thousand characters to complete the change. Remove the "0" after one billion digits and add one billion words to correct it.
On the jingle of practical comparison of schemes: practical comparison of schemes, careful analysis is not urgent. 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.
16, the method of "ten": think of 1 when you see 9, and think of 2 when you see 8; See 7 think of 3, see 6 think of 4; When you see the big corner decimal system, switch the two numbers first.
10 points 9 and 1, really naughty; 7, 3, 8, 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)
17, multiplication formula of Shang songs: If you want to multiply, you have to calculate division; if the formula is missing, you have to do business. To find the quotient by multiplication formula, first think about the formula carefully: if one number is missing, it is the quotient.