1. Contents and characteristics of the mathematics tabloids in the first grade of primary school
Bear runs a fruit shop in the mountain village. Apple 1 0.8 yuan, watermelon and 3.2 yuan. The bear shop, where chickens, kittens and puppies come and go in the mountain village, is endless and very lively.
The kitten said, "I'll buy six apples, one for 0.8 yuan and one for 4.8 yuan. I'll give you 10 yuan and you call me 5.2 yuan. " The dog said, "I'll buy three watermelons, 3.2×3=9.6 yuan." The bear was so busy that he had to say, "OK, OK, OK."
I've been busy for a long time, and finally I can be quiet.
Unexpectedly, the fox came and said, "I'll buy 20 apples and 20 watermelons. For convenience, we average apples and watermelons as 2 yuan. Together, it is 40 yuan. "
The bear is in charge. It seems to be more than 40 yuan. I also calculated by computer that it should be 80 yuan, not 40 yuan!
Bear and fox have been arguing, but they still can't make up their minds. They went to see Uncle Goat.
They found Uncle Goat and told him the whole story in detail. I saw Uncle Goat say earnestly, "In fact, you have all been taken in by ordinary people." Later, Uncle Goat told Little Bear and Fox how to calculate it bit by bit.
The unit price of apples and watermelons should have been multiplied by their total amount by the law of multiplication and distribution: (0.8+3.2)×20=40 (yuan).
Bear and fox suddenly realized that mathematics is so useful in life that they should study it well in the future.
2. The contents of the mathematics tabloid in the first grade of primary school
After school, the teacher assigned a special math homework-making learning tools, and said that it is ok to do it according to the requirements of the second question on page 36 of the textbook. I started doing it as soon as I got home. I took out my scissors and cut the cardboard into two disks, one large and one small.
Then determine the center of the circle, divide the circle into nine equal parts, and then write the nine numbers 1~9 on two circular surfaces respectively. Finally, find a toothpick to pass through the center of the circle and fix the two circles together. After I finished, I read the instructions in the book: turn around and say the product of multiplication of two aligned numbers. Every time you turn a grid, you can work out nine numbers. I started playing at once, turned around and said I would count to nine. After another round, I can form nine different multiplication formulas. This learning tool is really a good helper for me to recite formulas!
3. The contents of the mathematics tabloid in the first grade of primary school
A, graphics can be divided into (1) plane graphics.
(2) Three-dimensional graphics
1. Plane graphics: square, rectangle, triangle, circle, parallelogram.
2, three-dimensional graphics: cuboid, cube, cylinder, sphere.
Second, the combination of graphics.
1, two identical triangles can be combined into a parallelogram; Two identical triangles can be combined into a parallelogram, a rectangle or a large triangle.
2. It takes at least 4 small cubes to form a big cube, and at least 8 small cubes to form a big cube.
3. Two rectangles can form a big rectangle. Two special rectangles can form a big square.
Four cuboids can form a big cuboid.
4. The contents of the mathematics tabloid in the first grade of primary school
1, from the right, the first digit is one, the second digit is ten, and the third digit is one hundred. Reading and writing methods: both reading and writing should start from the high position.
2. Singular number: a natural number with the unit of 1, 3,5,7,9.
3. Even numbers: natural numbers with units of 0, 2, 4, 6 and 8 (except 0).
4. Integer: a natural number with the unit of 0 (except 0).
Five tens and five ones make fifty-five. (Five decimal places means five tens, and five decimal places means five ones. )
Reading: 55 (writing Chinese characters) Writing: 55 (writing mathematical characters)
6, 10 one is ten, 10 ten is one hundred. (One, ten and hundred are counting units. Write Chinese characters)
Composition of numbers: (Pay attention to different ways of asking questions)
Example: 68 consists of 6 tens and 8 ones; 68 consists of 8 1 and 6 10.
There are (6) tens and (8) ones, and (68) ones.
The decimal digit is 6, which means 6 tens (writing Chinese characters), and the unit digit is 8, which means 8 ones (writing Chinese characters).
7. The method of comparing the size of two digits: look at the ten digits first, and the bigger the number, the bigger it will be. If the ten digits are the same, if you look at one digit, it will be bigger. (The opening faces a large number and the tip faces a decimal number. )
8. When the difference between the two quantities is large, it can be described as "much more, much less"; When there is little difference between the two quantities, it can be described as "more, less".
9. The smallest three digits are100; The two digits of are 99; The smallest two digits are10; One digit of is 9; The smallest number is 1.
5. The contents of the mathematics tabloid in the first grade of primary school
Synthesis and decomposition of 10 nursery rhymes
You shoot one, I shoot one, we love learning since childhood. 1+9= 10, 10 can be divided into 9 and 1.
You shoot two, I shoot two, help each other and be good partners. 2+8= 10, 10 can be divided into 8 and 2.
You shoot three, I shoot three, and form a good habit of talking about hygiene. 3+7= 10, and 10 can be divided into 7 and 3.
You shoot four, I shoot four, and I'm on duty after school. 4+6= 10, and 10 can be divided into 6 and 4.
You clap five, I clap five, raise your hand when you ask and answer questions. 5+5= 10, 10 can be divided into 5 and 5.
You shoot six, I shoot six, and strive for the upper reaches. 6+4= 10, and 10 can be divided into 4 and 6.
You shoot seven, I shoot seven, and build an advanced class group. 7+3= 10, 10 can be divided into 3 and 7.
You clap eight, I clap eight, and everyone praises all-round development. 2+8= 10, 10 can be divided into 2 and 8.
You shoot nine, I shoot nine, and it's not sloppy to check again and again. 9+ 1= 10, 10 can be divided into 9 and 1.
You shoot ten, I shoot ten, and do things honestly. 10+0= 10, which can be divided into 0 and 10.