1, average score: each share gets the same amount, which is called average score. Division is used to solve the problem of average score.
Including division and average score (see the review points in Unit 2 for details)
24 exercise books, distributed to 6 people on average. Column type:
24 exercise books, 4 for each person. Column type:
Division part name
42÷7=6 42 is (dividend), 7 is (), and 6 is (); This formula is pronounced ().
2. About the formula
A formula can write four formulas (except "5525" and other words with the same factors).
The formula "3824" is ()
a、24÷6= B、4×6= C、24÷3= D、24÷4
Note: "formula" and "reading" should not be confused.
3. Multiple problems
Find out how many times one number is another. 6 is () times that of 2.
Find the multiple of a number. 4 times of 8 is () times. Don't confuse these two problems.
It is not easy to make mistakes in grouping questions.
Second, this painting is three times:
Step 4 solve the problem
Choose your own two-step calculation or synthesis formula.
Comprehensive formula: multiply first, then divide, then add and subtract. If there are brackets, count them first.
Second, the understanding and addition and subtraction of numbers within ten thousand.
1, number, number sequence table
Count one by one, ten by ten, one thousand one hundred, eleven thousand.
10 One thousand is (); 1500 consists of () hundred; 2340 consists of () ten.
The numbers adjacent to 2898 are () and ().
Count to 1 100 and write the five numbers after 2880.
In the numerical sequence table, from the right, the third digit is (), and the ten thousand digits are (); To the right of the hundred is ().
2. Composition of reading, writing and counting
Don't read the zero at the end. There is a zero or two zeros in the middle. Read only one zero.
Three ones, 705 thousand. This number is written as () and pronounced as ().
20 19 is pronounced as (); 7008 is pronounced as ()
The main ways to express a number 5003 are: 5003, 5,000 and three ones, drawing beads on the counter or 5000+3 written by students themselves.
3. Specific size
Same number of digits, different number of digits.
Pay attention to whether the topic requirements are arranged from big to small or from small to big;
4. Approximation
The estimation contents of "approximation" and "approximation" can be rough estimation or fine estimation.
Under the requirement of "rounding", find the nearest integer of ten, hundred and thousand. Proximity numbers are not unique and are treated differently in different situations. (Textbook pages 77 and 98)
Pay attention to reviewing the exercises on pages 100 and 10 1 in the textbook. When doing the problem, we should pay attention to finding out the key word "about" that needs to be estimated.
5, whole thousand, whole hundred plus or minus whole thousand, whole hundred
In the column (written calculation), the same digits should be aligned, starting from the unit, from ten digits to one digit "1" (from ten digits to hundreds, from hundreds to thousands "1"); Abdicate (if the number of ten is not enough, then "1" will reach one hundred, and "1" will be regarded as 10).
3500+3000= 870-780= 560+370=
Third, graphics and transformation
A corner has () vertices and () edges.
Is greater than the right angle (), less than the right angle is ().
Relationship: obtuse angle-right angle-acute angle
When drawing a corner, you must mark the corner symbol.
At 1 on the clock face, the angle formed by the hour hand and the minute hand is (), and after 2 hours, the angle formed by the hour hand and the minute hand is ().
Common translation phenomena: elevator lifting, sliding drawers, windows, cable cars,
Common rotating phenomena: electric fans, windmills, faucets,
Four, grams and kilograms
We use () as the unit for weighing lighter objects and () as the unit for weighing heavier objects.
A two-cent coin is about 1 g, and two bags of 500 grams of salt are 1 kg.
Usually, small things such as sugar, coins, chalk, biscuits, milk and a bottle of water are in grams, while big things or live pigs, people and a car full of coal are in kilograms.
Remember: our weighed schoolbag weighs 3-4 kg, the empty water cup weighs 100 g, the math book weighs 200 g, the average apple weighs 100-200 g, Miss Wei weighs 50 kg, the pumpkin weighs 4 kg, the salad oil weighs 5 kg, and the football weighs about 450 g.
V. Statistics and discovery rules
Observe the statistics carefully and pay attention to the unit.
Look for rules, and write or draw more rules according to the teacher's requirements before filling in the blanks. If you want to design your own rules, don't be too complicated.
Sixth, solve the problem.
Be sure to read the questions carefully, find out the problems to be solved in the first step, pay attention to the unit and answer the questions.
Multiplication has no unit. The answer should be complete.