A complete collection of basic mathematics knowledge for grades one to six, treasured for children!

The children\’s rhyme \”Ten\” in the first grade can be used when you see 9 and think of 1, when you see 8 and think of 2, when you see 7 and think of 3, when you see 6 and think of 4, when you see large numbers and decimals, first change the positions of the two numbers. Children\’s Rhymes about Time: When the hour hand passes through the numbers, it indicates how much time there is. If you want to know how many extra minutes there are, please look carefully at the minute hand. The small dials with hour and minute hands are round and round, and the hour and minute hands run in circles. The minute hand is long, the hour hand is short, one is fast and the other is slow. The minute hand has completed a full circle and the hour hand has just traveled a short distance. You take one shot of the synthesis and decomposition of 10, and I take one shot. We have loved learning since childhood. 1+9=10, 10 can be divided into 9 and 1. You shoot two, I shoot two, we help each other and are friendly partners. 2+8=10, 10 can be divided into 8 and 2. You shoot three, I shoot three, and develop good hygiene habits. 3+7=10, 10 can be divided into 7 and 3. You shoot four, I shoot four, and do your duty seriously after school. 4+6=10, 10 can be divided into 6 and 4. You give me five, I give you five, and you have to raise your hand when you ask questions. 5+5=10, 10 can be divided into 5 and 5. You shoot six, I shoot six, work hard to get the upper hand. 6+4=10, 10 can be divided into 4 and 6. You shoot seven, I shoot seven, and create an advanced class collective. 7+3=10, 10 can be divided into 3 and 7. If you shoot eight, I will shoot eight, and everyone will praise you for your comprehensive development. 2+8=10, 10 can be divided into 2 and 8. You shoot nine, I shoot nine, check repeatedly and don’t be careless. 9+1=10, 10 can be divided into 9 and 1. You give me a thumbs up, I give you a thumbs up. You have to be honest when doing things. 10+0=10, 10 can be divided into 0 and 10. Children of the RMB synchronization song, hurry up and line up, hold hands and tell the unit to see who can speak quickly and correctly. The units of RMB are yuan, jiao and cents, and the advance rate is 10. Please keep in mind. 1 yuan is worth 10 cents; 1 dime is worth 10 cents, and 1 yuan is equal to 100 cents. Second grade table multiplication table (continuation for students) You shoot one, I shoot one, the little butterfly wears a floral dress. (One-one is one, one-two is two,…one-nine is nine) You shoot two, I shoot two, Qiaoyan lives under the roof of my house. (Two two makes four,…two ninety-eight) You shoot three, I shoot three, and the bird spreads its wings and flies into the sky. (Three-three makes nine,…three-nine-twenty-seven) You shoot four, I shoot four, the little cat catches the mouse. (Four-four-sixteen,…four-nine-thirty-six) You shoot five, I shoot five, watching tigers in the zoo. (Five-five-twenty-five,…five-nine forty-five) You shoot six, I shoot six, six little rabbits picking mushrooms. (Six-six-thirty-six,…six-nine fifty-four) You shoot seven, I shoot seven, and the chicken sings. (Seven seven forty-nine,…seven nine sixty-three) You shoot eight, I shoot eight, and the tadpole grows up and turns into a frog. (Eight, eight, sixty-four, eight, nine, seventy-two) You shoot nine, I shoot nine, little fish swim in the water. (Nine Nine Eighty One) Carry addition song within 20 looks at large numbers, divides them into decimals, rounds up to ten, and adds fractions. Retreat and subtract within 20. Retreat and subtract within 20. The oral calculation method is very simple. Tens are reduced by one, and tens are added. You can write the numbers accurately and quickly. The meaning of addition is to combine two numbers with addition. The result of addition is called sum. Numbers are numbered from the right, don\’t forget to add ten to one. The meaning of subtraction is to use subtraction from big to small. The result of subtraction is called difference. The digits are aligned from the right, if not enough, take the first digit. To abdicate, subtract, to abdicate, to subtract, you must remember, start with the ones positionCome and subtract; when you see 0, go forward and see which digit has the number; if you borrow it, go backward, and the dot above 0 is regarded as 9. Don\’t forget to retreat if there is not enough front position, and add ten to the base position; if the other position is retreated by 1, it is best to remember that 0 becomes ten. Rules for adding integers There are rules for adding integers, and the same digits must be aligned. If you are not satisfied with the ten, you will fall into the original position, and if you are full of ten, you will advance to the upper position. Collect more than ten numbers and drop them down, whichever number you add will drop down. Adding the carry addends together, the result is not different by half a cent. Integer subtraction rules There are rules for integer subtraction, and the same digits must be aligned. When the drop difference is large, it decreases, and when it is small, it borrows the position. Borrow one, subtract ten, and then add. The results of addition and subtraction will fall into place. Be careful when borrowing continuously, and keep in mind the remaining number after borrowing. The third-grade one-digit multiplication rule starts from the lowest digit of integer multiplication, and the one-digit multiplication is a product. Multiply a single digit number to get a number of ones, and the last digit of the product is the ones digit. The calculation is accurate and the correct position is based on the multiplication formula. For divisions where the divisor is a decimal, the divisor is a decimal and the shift must be remembered. Move the decimal point to make it an integer, move the divisor by a certain number, and move the dividend by a certain number. If there are not enough digits, add 0 to fill the digits. Division rules where the divisor is a single digit are integer division starting from the high digit. The divisor depends on one digit. If one person is not enough to look at two people, we will have to deal with whichever one we choose. The remainder is smaller than the divisor and is not enough to occupy the quotient of one zero. The division rules for integer division when the divisor is a two-digit number start from the high digit. Divide two digits by looking at two digits. Two people are not enough to see three people, so whoever is chosen should be chosen. The remainder is smaller than the divisor and is not enough to occupy the quotient of one zero. Multi-digit division rules Integer division starts from the highest order. How many divisors are there? This person is not enough to look at the next person, except whoever is the businessman. The remainder is smaller than the divisor and is not enough to occupy the quotient of one zero. The four mixed operations nursery rhyme will give you an overview of the whole question and make a plan to see if it can be simplified; calculate from left to right, multiply and divide first and then add and subtract; the brackets are small, medium and large in order, calculate the inside first and then the outside; horizontal calculation and vertical test, A step-by-step check is the multiplication rule for the key factor with 0 at the end. If there is 0 at the end of the factor, write it after the factor without multiplying it first. After the multiplication, add 0 to the product. If there are 0s, write as many 0s as there are. When reading songs with multiple digits, read them from the highest position, and read which digit it is; if there is a zero at the end of each level, there is no need to read it out and remember it; other digits have consecutive zeros, only read one and note it carefully; four digits are one level The reading rules for writing multi-digit songs are always to start from the high digits when writing multi-digit songs, add \”ten thousand\” at the end of ten thousand level and billion level, and add \”hundred million\” at the end of billion level. Which bit has no unit, remember to use \”0\” to top it. Multi-digit size comparison songs have different digits, the ones with more digits are bigger, and the ones with fewer digits are smaller. If the digits are the same, you can know by comparing the high digits. Fourth grade two-digit multiplication rules: Integer multiplication starts from the lowest digit, and two-digit multiplication is the product of two times. Multiply a single digit number to get a number of ones, and the last digit of the product is the ones digit. How many tens can be obtained by multiplying tens digits? The last digit of the product is the tens digit. Calculate the correct position and add the two products together. Multiplication of two-digit numbers Multiplication of two-digit numbers is not difficult. There are three points in the calculation process: the ones digit of the multiplier must be calculated first, and then multiplied again by the tens digit. The last digit of the product is the key, and it must be opposite to the tens digit; the two products are combined. After adding, calculate layer by layer and keep in mind. Multi-digit multiplication rules: Integer multiplication starting from the lowest digit, multi-digit multiplication and several products. Multiply a single digit number to get a number of ones, and the last digit of the product is the ones digit. How many tens can be obtained by multiplying tens digits? The last digit of the product is the tens digit. Calculate accuratelyGood bit, several products are added together. Rules for Adding and Subtracting Decimals There are rules for adding and subtracting decimals, and the same digits must be aligned. Ones place versus ones place, tens place versus tens place. …The tenth place is against the tenth place, and the hundredth place is against the hundredth place. …In a word, the decimal points must be aligned. The calculation result is a decimal, and there are 0s at the end that need to be crossed out. The property of constant quotient is that the dividend and divisor are multiplied at the same time, and the factors of the multiplication must be the same. The dividend and divisor are the same as division, and the numbers they divide by are also the same. Except 0 for multiplication and division, remember clearly the property that the quotient remains unchanged. \”Year, month, day\” jingle: 1, 3, 5, 7, 8, 10, twelfth lunar month, 31 days is always big. April, June, September and November are always 30 days. February is the most special month, with changes coming on the 28th and 29th. In leap years it is twenty-nine, and in ordinary years it is twenty-eight. 4 In addition to the year number, there is a balance, and the centenary number is marked with double 0. Rounding Method Children\’s Rhymes The rounding method is good, and there is a way to find approximate numbers; look at the lower digit of which number you get, and then compare it with the word 5; if 5 is a big 5, advance 1, and all numbers with a small 5 are discarded; the equal sign is replaced with an approximate equal sign. , so that people can understand it at a glance. To calculate the mixed test questions of Order of Operations, clear order is the key. It is best to perform operations at the same level, from left to right. Both levels of operations appear, with multiplication and division first followed by addition and subtraction. What should I do if I encounter parentheses? The brackets should be small, middle and large in order, small brackets should be counted first, and square brackets should be counted later. The order must not be messed up. Horizontal calculations and vertical tests should be checked every step of the calculation. It is correct, fast and beautiful. The multi-digit song was rewritten by removing the \”0\” after the ten thousand digit and adding the ten thousand character. The modification was completed. Remove the \”0\” after the billion digit, add the word \”billion\” and change it. If there is a 0 in the middle or at the end of the quotient, I am 0. I am very capable and my division operation shows my magical power. If it\’s not enough, I\’ll make up for it. When a seat becomes available, I take it. If others want to get rid of me, I will always be the victorious general. Comparison of fractions in fifth grade. Remember the numerator and denominator well. If the denominators are the same, the numerator will be the larger one. If the numerators are the same, the denominator will be the same. If the denominator is the larger denominator, the fraction will be smaller. For divisions where the divisor is a decimal, the divisor is a decimal and the shift must be remembered. Move the decimal point to make it an integer, move the divisor by a certain number, and move the dividend by a certain number. If there are not enough digits, add 0 to fill the digits. Decimal Multiplication Rules When multiplying decimals starting from the lowest order, calculate the product by integers first. Let’s look at how many decimals there are in the factors. Starting from the right side of the product, count the number and dot it. Cross out any 0 at the end. Rules for decimal division Start from the top of decimal division and look at the divisors to find the rules. The divisor is a direct division of an integer. Which quotient is divided into which quotient is insufficient is zero, and the quotient and the dividend are aligned. The divisor is converted from a decimal to an integer, and the decimal point of the dividend is moved to the same position. If there are not enough digits on the right, zeros should be used to fill them. The number of pairs of songs indicates that the position has a unique trick, and a set of data marks the position. The numbers on the left are columns and the right are rows. The columns go first and then the prime numbers within 100 cannot be adjusted. The formula for prime numbers within 100 is 2, 3, 5, 7 and 11. 13 is followed by 17, 19, 23, 29, (nineteen, two three, twenty-nine) 31, 37, 41, (three-one, three-seven, forty-one) 43, 47, 53, (four-three, four-seven, fifty-three) 59, 61, 67, (five-nine, sixty-seven, sixty-seven ) 71, 73, 79, (seventy-one, seventy-three, seventy-nine) 83, 89, 97. (eighty-three, eighty-nine, ninety-seven) Song of Judgment of Coprime NumbersSimplify the ratio of fractions, both ends of the coprime numbers. Observe five points: 1 and all numbers; two adjacent numbers; two primes must be mutually prime. Large numbers are prime numbers, and two numbers must be relatively prime. Small numbers are prime numbers, large numbers are not multiples. Multiplying fractions by whole numbers in sixth grade is a very simple calculation; multiply the numerator by an integer without changing the denominator; if you want the calculation to be simple, reduce the fraction first; if you want the result to be accurate, fractionalization is the simplest. Mixed operations and simple operations on fraction multiplication. Four mixed operations on fractions. Keep the order of operations in mind. There are no parentheses for multiplication, addition, multiplication and subtraction. Addition and subtraction come last and multiplication comes first. Level one, level two, and four are counted, and level two is counted before level one. With the change in bracket order, the inside is calculated first and then the outside. The laws of operation are still useful, and they become simpler when used appropriately. Fraction multiplication rules Fraction multiplication is simpler, the numerator and denominator are calculated separately. Multiply the numerators to form the numerator, and multiply the denominators to form the denominator. The numerator and denominator are not mutually prime, so reduce them first and calculate later. Fractional division rules Fractional division is the simplest method, converted to multiplication to calculate. After the division sign becomes a multiplication sign, the reciprocal of the divisor appears. Fraction multiplication and division Fraction multiplication is easy to learn and understand, just multiply the numerator and denominator separately. The meaning of the calculation must be clarified, and it will be easier to make up and down calculations. The method of dividing fractions is wonderful, the original division sign becomes a multiplication sign. The divisors are reversed, which is indispensable for calculations. The approximation song is about approximation, approximation, multiplication and approximation, saving time and effort. From top to bottom, from left to right, clarify the data without missing a beat. When encountering a decimal, round off the dots and round them up. If there are not enough digits, use \”zero\” to make up for it. Find unit \”1\” The jingle unit \”1\” is cleverly hidden and will be found based on the score. Stand well in front of \”among them\”, sit well behind \”is, account for, ratio\”; you can find the \”question and answer style\”, and you must do a good job in supplementary explanations. Percents are often encountered, so it is polite not to use the word \”rate\”. Find a pair of good friends and determine the multiplication and division signs.