Know it several times and divide a moon cake into four parts on average, each part is its (), and record it as ().
Read as: ()
Compare the size of the score ○ My method:
Know how many times an apple is divided into four parts on average, and three of them are its.
(), written as ().
Read as: ()
3 ... () means:
..... () said:
4 ..... () means:
Comparing fractions with the same denominator ○ My method:
Simple addition and subtraction of fractions with the same denominator-=+=
My method:
1 minus a fraction 1-= ()-= ()
Method: Convert 1 into (), and then subtract.
My feelings:
Unit evaluation and research volume of "Preliminary Understanding of Fractions"
I. Fill in the blanks:
1, pronounced (), contains ().
2. Divide an apple into three parts on average, and each part is apple's ().
3,5 is (), it is ().
4. The numerator of a fraction is 9, the denominator is 15, and this fraction is ().
5. Divide a watermelon into five parts, one of which is watermelon's ().
6, a bottle of coke, drink it, and ().
7. The order of,, is ()-().
8. Use scores to represent the shaded parts in the picture below, and compare their sizes.
( ) ( ) ( ) ( ) ( ) ( ) ( ) ( )
9, according to the graphic calculation:
10,48 is () () 56 is () () 8 19 is ()
1 1 and 1-47 can be regarded as () minus () 17, which is equal to () ().
12, fill in the count.
( 1)
There are () triangles, accounting for () of the total, and () triangles are 1.
( )。
There are () cycles, accounting for () of the total, and () cycles are 1.
( )。
There are () squares, accounting for () of the total, and () squares are 1.
( )。
(2) ( )
12 is () times that of 6, and 6 is () of 12.
12 is () times that of 2, and 2 is () of 12. (Fill in a few scores)
13. Fill in the appropriate score in ().
>( ) >( ) ( )> ( )﹤
14, 1=( )=( )=( )= () (fill in a score)
2. Judge right or wrong.
(1) A circle is divided into four parts, and each part belongs to it. ()
(2) Any score is less than 1. ( )
(3) There is a piece of paper, and 25 pieces are cut off, leaving 35 pieces of this paper. ( )
(4) Divide a line segment into seven segments on average, four of which are four sevenths of it. ()
(9) There are two cups. Each cup is filled with 12 water, and when poured together, it is a glass of water. ( )
Third, color according to the score.
Third, use the score to represent the shaded part in the picture below.
( ) ( ) ( ) ( )
( ) ( ) ( ) ( )
Fourth, write numbers directly.
+ = — = — = + + =
+ = — = 1— = 1— — =
+ = + = + = + + =
Five, solve the problem:
1, cleaning, clearly responsible for cleaning the glass, he has already cleaned it. Excuse me: how much more does he have to wipe before he can finish it all?
2. What percentage of the new books in the school are all assigned to Grade One, Grade Four and Grade Two? How much is left?
Mother divided a piece of cloth with a length of 1 m into three pieces. The first piece is meters long, the second piece is meters long, and how long is the remaining piece?
There are two equal cups of juice, Fangfang and Beibei each drink one. Which of them drinks a lot? Who has more left?
5. 27 parts of a rectangular paper are painted blue and 37 parts are painted red. What percentage of this paper is uncolored?
6. In the green belt of a community, 39% of the land is planted with cypress, and the rest is planted with pine. What percentage of the whole green belt is planted with pine trees?