Mathematical formulas and concepts are used throughout the entire mathematics learning process. How well does your child master mathematical formulas and concepts?
The primary school stage is an important stage for children to learn new knowledge. In order to help children learn and review better, today we have specially summarized all the formulas, unit conversions, quantitative relationships, and difficult knowledge about mathematics in 1-6 grades . Children only need to Once you master these four key points of knowledge, you will definitely get twice the result with half the effort!
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mathematical formula
- quantity relationship calculation formula
1, unit price
6, one addend = sum - another addend
7, minuend - minuend = difference
8, minuend = minuend - difference
9, minuend = minuend + difference
10, factor × factor = product
11 , one factor = product ÷ another factor
12, dividend ÷ divisor = quotient
13, divisor = dividend ÷ quotient
14, dividend = quotient × divisor
15, division with remainder : dividend = quotient × divisor + remainder
A number is continuous To divide two numbers, you can first multiply the last two numbers and then divide the number by their product. The result will not change. Example: 90÷5÷6＝90÷(5×6)
1 kilometers=1 kilometers
1 kilometers=1000 meters
1 meters=10 decimeters
1 decimeter=10 centimeters
1 centimeters=10 millimeters
1 square meters=100 square meters Decimeter
1 square decimeter = 100 square centimeters
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02
Concept nursery rhymes
- Multiplication tables nursery rhymes
A frog has one 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.
- children's songs of the year, month and day
135780 (December).
Thirty-one days are never bad.
Winter (November) 30th.
February is special and cannot be forgotten.
February 28th in ordinary years.
put OnePlus in February of leap year.
- Children's songs for understanding time
The hour hand passes by the number, indicating how much time it is.
If you want to ask how many points are added, please look at the minute hand carefully.
- The hour and minute hands
The small dial is round and round, and the hour and minute hands run in circles.
The minute hand is long and the hour hand is short. One is fast and the other is slow.
html The 0 minute hand has completed a full circle, and the hour hand has just traveled a short distance.- How many digits should a number be divided by? Children's Rhymes
Look at the highest digit of the dividend, there is not enough high digit. The quotient is written in whichever digit
divides into as the dividend. If
is not enough to quotient 1, write 0, and the first and last digits in the quotient are counted.
The remainder is smaller than the divisor, so the operation is correct.
- Decimal addition and subtraction children's songs
Calculate decimal addition and subtraction, the key is to align the decimal points.
pads the last bit with 0 so that addition and subtraction can be performed.
- Four Mixed Operations Children's Rhymes
Go through the entire problem and determine the solution, and see if it can be simplified.
performs calculations from left to right, multiplying and dividing first, then adding and subtracting.
The brackets are small, medium and large in order, counting the inside first and then the outside.
horizontally calculates and vertically checks, one step at a time is the key.
- Solutions to Word Problems Children's Songs
Read the questions several times and look for the key.
first looks at what it is looking for, and then looks for the conditions.
reasonably lists the formulas and calculates carefully.
Ask for multiple solutions to one question, don’t forget the unit. The results of
need to be checked and the answer is finally written.
- Rounding Method Children's Rhymes
The rounding method is good, and there are ways to find approximate numbers. Which bit of
is taken depends on the next bit, and then compared with the 5 characters.
is 5 larger than 5 and advances by 1, and all values smaller than 5 are discarded.
The equal sign is replaced by an approximate equal sign, so that people can understand it at a glance.
- Sequence of Operations Songs
Beat the bamboo board, the sound is heard all over the sky, all students, listen to me.
Today I will not talk about other tables and four arithmetic operations. To calculate the
mixed test questions, clear order is the key.
is the easiest to perform operations at the same level, from left to right. Both levels of operations in
appear, with multiplication and division first and then addition and subtraction. What should I do if
encounters brackets? Those in parentheses count first.
counts after the square brackets, and the order must not be messed up.
checks every calculation step, and feels right and happy.
- multi-digit reading method song
The reading should start from the high position, which number is read.
If there is a zero at the end of each level, do not read it out and remember it.
The other digits are consecutive zeros, read only one and remember carefully.
000000000000000000000000000000000000010000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 Always remember the
reading rules.
- Multi-digit writing method
The number should be written from the highest position, and whichever number is the number should be written. There is no unit in any bit of
. Remember to use "0" as the top bit.
- multi-digit size comparison song
digits are different in size, the one with more digits is larger, and the one with fewer digits is smaller. The 0 digits of
html are the same size, you can know by comparing the high digits.- About the "ten" method
When you see 9, you think of 1, when you see 8, you think of 2.
thinks of 3 when it sees 7, and thinks of 4 when it sees 6. When
sees a large number plus a decimal, it first changes the positions of the two numbers.
10's share.
9 and 1, so naughty.
7, 3, 8, 2 are also naughty.
blows 6 to 4 (6 is like a whistle, 4 is like a flag).
Little hands are so smart (let students shake their hands as if dividing 10 into 5 and 5).
- Tree planting problem
Children, open your hand, everyone has five fingers,
There are several spaces between the fingers, please take a closer look.
Division with 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
is not enough, I will 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.
- abacus reading and writing numbers
The little abacus is really magical, it is the easiest to read and write numbers. The four-digit first level of
is the key. Reading and writing start from the high position.
html The first 0 in the level 0 reads one, and the 0 at the end of the level does not start.billion level, ten thousand level, imitate one level, add units after reading.
is written one level at a time, and the beads do not rely on the beam 0 to occupy the space.
- Multi-digit size comparison
Multi-digit size depends on the number of digits, the number with more digits is larger.
html If the 0 digits are the same, look at the high digit. The larger the high digit, the larger the number.
- Comparison of fraction sizes
Comparison of fraction sizes. Remember the numerator and denominator well.
If the denominators are the same, look at the numerator. The larger the numerator, the larger the fraction.
If the numerators are the same, look at the denominator. The larger the denominator, the smaller the fraction.
- -column equation solution word problems
-column equation solution word problem, grasp the key to analyze.
known conditions are replaced with numbers, and unknown conditions are replaced with letters.
find the relevant algebraic expressions, connect them and read them.
- Unit of Measurement Singing Song
Children, hurry up and line up, holding hands to measure the unit. Let’s see who speaks quickly and rightly.
The unit of RMB is yuan, jiao, cent. Please keep in mind that the advance rate is 10.
1 yuan is worth 10 jiao, 1 jiao is worth 10 points, and 1 yuan is equal to 100 points.
meters, decimeters, centimeters and millimeters. The maximum unit of
is kilometers.
1 meter = 10 decimeters, 1 decimeter = 10 centimeters, 1 centimeter = 10 millimeters.
meters and kilometers are also adjacent, and the progress rate of 1000 is a special case.
tons and kilograms and grams, please keep in mind that the rate is 1000.
shape unit is easier, adjacent to 100 is the area, adjacent to 1000 is the volume.
has large units and small units, and the size conversion is regular.
Multiply the progression rate from large to small, and the decimal point moves to the right; divide by the progression rate from small to large, and the decimal point moves to the left. The entry rate of
is shifted by one for 10, the entry rate of 100 is shifted by two places, and the entry rate of 1000 is shifted by three places. And so on.
- decomposes prime factors
decomposes prime factors by short division.The divisor of
is a prime number, and the quotient is also a prime number. The form expressed by
is very simple: composite number = prime number The public divisors of
are called common divisors, and the largest common divisor is called the greatest common divisor of , .
If the common factor is only 1, they are called coprime numbers. The public multiples of
are called common multiples. The smallest common multiple is called the least common multiple of , . There are differences in how to find
, so don’t make a mistake.
short division only multiplies the divisor to find the greatest common divisor.
The divisor and quotient must be multiplied together to find the least common multiple.
