The winter vacation solution of second grade mathematics

Answer 1: 1. Fill in the appropriate units.

A bag of rice weighs 25 () and a bag of salt weighs 500 (? )

A bag of biscuits weighs 250 ()? A car weighs 6 (? )

A coin weighs 1 () and a blue whale weighs 35 ()

2. Unit conversion

2 tons 200 kg = () kg

5 kg = () grams

14000kg = () tons

2 tons = () kg

3. math diary: Find out the mistakes and correct them.

September Sunday 10? very good

I ate a 45 kg ham sausage and drank a bag of 225 kg milk this morning. Then I took a taxi weighing about 1 g with my parents and came to the zoo. First we saw a panda weighing about 80 tons, and then an elephant weighing about 8 kilograms. I said, "Is this big elephant probably the biggest animal in the world?" Dad said, "No, the heaviest animal in the world is the blue whale, which belongs to an adult blue whale. Its weight is about 150-200 kg. " I think: the weight of that blue whale is equivalent to the weight of more than 20 elephants. How big would it be if more than 20 elephants crowded together? What a big blue whale!

Reference answer:

1、

Kilogram? Scold or fight?

g？ many

2、2200 5000 14 2000

3, 45 kilograms to 45 grams.

Replace 225 kg with 225 g.

Change the weight from 1g to1t.

Change 80 tons into 80 kilograms.

Change the weight from about 8 kilograms to about 8 tons.

150-200kg was changed to150-200t.

Answer 2 1. Fill in the blanks.

Choose the appropriate numbers from 62, 27, 54, 73, 38, 28 and 46 to fill in the blanks.

()+()=()+()=()+()

After Xiao Ming gave Xiaojun 18 yuan, they both had the same amount of money, so Xiao Ming had () yuan more than Xiaojun.

Students do exercises, from top to bottom, Xiaojun is at 28, from bottom to top, Xiaojun is at 27, and this team has () students.

() How much can I fill in?

()-9﹤80 80-()﹤20+25

30+()-40 26 cm+() cm-1 m

() m-80m-1 6m-1m-() cm-12cm.

Divide 10 into () and (), and the product of these two numbers is the largest.

Xiaoming lives on the fifth floor. It takes him 1 minute to get to the next floor, and () minutes to go home from the sixth floor to the fifth floor.

Xiaoli gets six flowers, Xiaohua gets three times more flowers than Xiaoli, and Xiaohua gets () flowers.

Saw a steel pipe with a length of15m into three sections on average, each section is () meters long, and it needs to be sawed () times.

There are three classes in Grade Two. If you transfer 1 students from Class Two to Class Two and Class Two, then the number of students in the two classes is equal. If the students of 1 are transferred from Class Two to Class Two and Class Three, there will be two more students in Class Two and Class Three. 1 Class is () more than Class 23.

Second, clever calculation (calculation by simple method)

400-29+362-7 1+38

399+299+599+ 199

Third, the application problem.

There are 43 students in Class 2 * * * in Senior Two, 2 less than Class 2 1 and 4 more than Class 2 1. How many students are there in Class 3 * *?

A basket of apples weighs 30 kilograms. Half of the apples were sold, and the basket was still18kg. How much does this basket weigh? How much does this apple weigh?

Three people weigh, Party A weighs 52kg, Party A weighs 46kg and Party B weighs 48kg. What is the weight of each of them?

The black cat caught 15 fish, the white cat caught 5 fish and the flower cat caught 7 fish. How many fish should a black cat give to a white cat and a flower cat, and how many fish should three cats have?

Attach the answer

fill (up) a vacancy

1.(62)+(38)=(54)+(46)=(27)+(73);

2.36;

3.54;

4.88, 36, 9 , 73 , 95 , 87;

5.5, 5;

6.4;

7.24;

8.5, 4;

9. 1, 2;

Second, clever calculation.