4. Calculate first, then explore the law: (4%)

1- 12 = () What do you find:

12 - 14 =( )

18 - 1 16 =( )

1 16 - 132 =( ) 。

According to the above findings,1-12-14-18-16-132-164-165433.

Look at the picture and answer the questions. (***6 points)

As shown on the right, arrange natural numbers:

1. In this digital array, two rows of six numbers are framed by rectangles (the rectangular boxes in the figure are only schematic). If the sum of the six numbers in the box is 192, do you know the smallest number among the six numbers in the box? .

2. If the box is only 48 at most, how many sums of different sizes can a * * * box produce?

Intransitive verbs solve problems.

1. The bus company's main station is the starting station of Bus No.28 and Bus No.2, with Bus No.28 running every 8 minutes and Bus No.2 running every 12 minutes. How many minutes does it take for two cars to leave at the same time?

2. An engineering team built an expressway with a length of 1000 km. 17 of the total length was completed in the first week, and 25 of the total length was completed in the second and third weeks respectively. How many parts of the total length need to be repaired?

3 3. 100 kg of peanuts can squeeze out 35 kg of oil. How many kilograms of oil can be squeezed out per kilogram of peanuts? How many kilograms of peanuts does it take to squeeze 1 kg peanut oil?

4. Guo Mao Hotel has two buildings with 8 floors and 12 floors, each with 20 rooms. If you are a manager, how do you plan to number so many rooms, so that your customers can know the specific location of their rooms when they get the room numbers? Write down your ideas and give examples.

5. Xiao Wei spent 25 hours doing his Chinese homework, 265,438+05 hours more than Xiao Gang and 65,438+04 hours more than Xiao Gang. Who spent less time, Obana Shawebi? How much is missing?

Xiaoming's family is going to lay a square floor tile in the new kitchen. Through measurement, it is known that the kitchen is 3 meters long and 2.4 meters wide. If you were allowed to buy it, what floor tile would you choose? And explain why.

7. The kindergarten bought five boxes of biscuits, each of which was 90kg, and distributed them to six classes on average. How many kilograms are allocated to each class? What is the ratio of five boxes of biscuits to each class?

8. There are two squares with the length of 20m and16m respectively. To make furniture, you need to saw them all into pieces of the same length, and there is no redundancy. What is the longest length of each piece of wood? How many segments can a * * * saw?

Here are some things I have sorted out.